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Notable events involving O 10 include:

The history of HrMs O 10 as compiled on this page is extracted from the patrol reports and logbooks of this submarine.

This page was last updated in March 2016.

10 May 1940
In the early morning hours, HrMs O 10 (Lt. G. Quint, RNN(R)), departed Den Helder to patrol off the Dutch coast. At 0600 hours a radio message is received that Holland is at war with Germany. O 10 remains on patrol. (1)

11 May 1940
Late in the evening HrMs O 10 (Lt. G. Quint, RNN(R)) enters Den Helder harbour. (1)

12 May 1940
In the evening, HrMs O 10 (Lt. G. Quint, RNN(R)), departed Den Helder together with HrMs O 9 (Lt. J. Metz, RNN) to make for England. They were escorted by the tug Witte Zee. (1)

14 May 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) arrived at the Downs. (1)

15 May 1940
HrMs Willem van der Zaan (Lt. Cdr. H.D. Lindner RNN), HrMs O 9 (Lt. J. Metz, RNN), HrMs O 10 (Lt. G. Quint, RNN(R)), HrMs O 23 (Lt.Cdr. G. Koudijs, RNN) and HrMs O 24 (Lt.Cdr. G.B.M. van Erkel, RNN) all departed the Downs for Porstmouth where they arrived the next day. (1)

29 May 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) departed Portsmouth for her 1st war patrol. She was ordered to patrol in the English Channel to the south of the Isle of Wight.

For the daily positions of HrMs O 10 during this patrol see the map below.

(2)

1 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) ended her 1st war patrol at Portland.

At Portland she is assigned to A/S training duties. (2)

5 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Fernie (Lt.Cdr. R.McC.P. Jonas, RN) and HMS Gardenia (Lt.Cdr. T.A.O. Ellis, RD, RNR). (1)

8 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Fernie (Lt.Cdr. R.McC.P. Jonas, RN) and HMS Gardenia (Lt.Cdr. T.A.O. Ellis, RD, RNR). (1)

9 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Ambuscade (Lt.Cdr. A.O. Johnson, RN) and the French trawler Asie. (1)

13 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Heartsease (Lt.Cdr. E.J.R. North, RNR). (1)

15 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Heartsease (Lt.Cdr. E.J.R. North, RNR) and two minesweepers. (1)

20 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Ambuscade (Lt.Cdr. A.O. Johnson, RN) and HMS Shemara (Cdr.(Retd.) H. Buckle, RN). (3)

21 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Valena (Capt. W.H. Poole, RNR). (3)

22 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Ambuscade (Lt.Cdr. A.O. Johnson, RN) and HMS Hambledon (Cdr. S.H. Carlill, RN). (3)

24 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Hurricane (Lt.Cdr. H.C. Simms, RN) and HMS Olvina (Lt.Cdr. C.G. Cuthbertson, RNR). (3)

25 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Valena (Capt. W.H. Poole, RNR). (3)

26 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Foylebank (Capt.(Retd.) H.P. Wilson, RN) and HMS Hambledon (Cdr. S.H. Carlill, RN). (3)

27 Jun 1940
HrMs O 10 (Lt. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Topaze (Lt.Cdr. J.N. Hambly, MBE, RN). (3)

30 Jun 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Olvina (Lt.Cdr. C.G. Cuthbertson, RNR) and HMS Geranium (T/Lt. A. Foxall, RNR). (3)

1 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Geranium (T/Lt. A. Foxall, RNR). (3)

2 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Geranium (T/Lt. A. Foxall, RNR) and HMS St. Modwen (Cdr.(retired) W.A. Ford, RN). (3)

3 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Valena (Capt. W.H. Poole, RNR). (3)

4 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Conqueror (Capt.(Retd.) E.T.R. Chambers, RN). (3)

5 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Portland together with HMS Conqueror (Capt.(Retd.) E.T.R. Chambers, RN). (3)

9 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) departed Portland for Rothesay. She made the passage together with HrMs O 9 (Lt. H.A.W. Goossens, RNN) and HrMs O 23 (Lt.Cdr. G.B.M. van Erkel, RNN). This later submarine was coming from Portsmouth.

The submarines were escorted by the Dutch torpedo boat HrMs Z 6 (Lt.Cdr. A.C. Lunbeck, RNN) during this passage. (3)

11 Jul 1940
The Dutch submarines HrMs O 9 (Lt. H.A.W. Goossens, RNN), HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)), HrMs O 23 (Lt.Cdr. G.B.M. van Erkel, RNN) and their escort the Dutch torpedo boat HrMs Z 6 (Lt.Cdr. A.C. Lunbeck, RNN) arrive at Milford Haven. (3)

14 Jul 1940
The Dutch submarines HrMs O 9 (Lt. H.A.W. Goossens, RNN), HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)), HrMs O 23 (Lt.Cdr. G.B.M. van Erkel, RNN) and their escort the Dutch torpedo boat HrMs Z 6 (Lt.Cdr. A.C. Lunbeck, RNN) arrive at Rothesay. (3)

19 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) was docked at Elderslie. (3)

27 Jul 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) was undocked at Elderslie. She then returned to Rothesay. (3)

1 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) conducted practice attacks on HMS Breda (Capt.(Retd.) A.E. Johnston, RN) in the Clyde area. (3)

2 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) conducted exercises in the Clyde area. (3)

3 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) shifted from Rothesay to Campbeltown. (3)

4 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Topaze (Lt.Cdr. John J.N. Hambly, MBE, RN), HMS Carina (Cdr.(Retd.) T.St.V.F. Tyler, RN) and HMS Lady Sharazad (Cdr.(Retd.) A.G. Venables, RN). (3)

5 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (Retd.) H. Buckle, RN) and HMS Lady Sharazad (Cdr.(Retd.) A.G. Venables, RN). (3)

6 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Capt.(Retd.) E.C. Stubbs, RN) and HMS Topaze (Lt.Cdr. J.N. Hambly, MBE, RN). (3)

7 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Topaze (Lt.Cdr. John J.N. Hambly, MBE, RN) and HMS Lady Sharazad (Cdr.(Retd.) A.G. Venables, RN). (3)

8 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (Retd.) H. Buckle, RN). (3)

9 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Lady Sharazad (Cdr.(Retd.) A.G. Venables, RN). (3)

10 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Capt.(Retd.) E.C. Stubbs, RN) and HMS Lady Sharazad (Cdr.(Retd.) A.G. Venables, RN). Upon completion of these exercises she shifted from the Campbeltown area to Rothesay. (3)

17 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) conducted exercises in the Clyde area. (3)

21 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) departed Rothesay for Dundee. She made the passage together with the British submarine HrMs Tuna (Lt.Cdr. M.K. Cavenagh-Mainwaring, RN) that was to proceed to Rosyth. They were escorted by the Dutch torpedo boat HrMs Z 6 (Lt.Cdr. A.C. Lunbeck, RNN). (3)

26 Aug 1940
HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)) arrived at Dundee where she was taken in hand for refit. (3)

2 Oct 1940
During her refit, HrMs O 10 (Lt.Cdr. G. Quint, RNN(R)), was docked at Dundee. (3)

29 Nov 1940
HrMs O 10 (Lt. J.H. Geijs, RNN) was undocked. She then continued her refit. (3)

11 Jan 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted a diving trial off Dundee. A leak was detected near the engine room hatch. (3)

27 Jan 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted trials off Dundee. (3)

1 Feb 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) continued her trials off Dundee. Much problems were experienced with the engine room cover hatch. (3)

22 Feb 1941
With her trials completed, HrMs O 10 (Lt. J.H. Geijs, RNN), departed Dundee for Rothesay. She made the passage in a convoy. (3)

25 Feb 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) suffers from engine failure. She parted with the convoy and made for Tobermory escorted by HMS Pentland Firth (Skr. H.C. Aisthorpe, RNR) where she arrived late on this day. (3)

28 Feb 1941
After engine repairs, HrMs O 10 (Lt. J.H. Geijs, RNN), departed Tobermory for Rosyth escorted by HMS Pentland Firth (Skr. H.C. Aisthorpe, RNR). (3)

1 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Rosyth. (3)

3 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted exercises in the Clyde area. These included several practice attacks on HMS Breda (Capt.(Retd.) A.E. Johnston, RN). (3)

4 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted exercises in the Clyde area. These included several practice attacks on HMS Breda (Capt.(Retd.) A.E. Johnston, RN). (3)

5 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted exercises in the Clyde area. These included several practice attacks on HMS Oberon (Lt.Cdr. E.F. Pizey, DSC, RN). (3)

6 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted exercises in the Clyde area. These included several practice attacks on HMS Oberon (Lt.Cdr. E.F. Pizey, DSC, RN). (3)

8 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Rothesay for Londonderry via Holyhead. She was escorted by HMS Walker (Cdr. D.G.F.W. MacIntyre, RN). (3)

9 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Holyhead. (3)

10 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Holyhead for Londonderry. She is escorted by HMS Winchelsea (Lt.Cdr. W.A.F. Hawkins, DSC, RN). (3)

11 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Londonderry. (3)

12 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Bluebell (Lt.Cdr. R.E. Sherwood, RNR). (3)

14 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Philante (Capt.(Retd.) H.S. Bowlby, RN). (3)

15 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (3)

16 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Salisbury (Lt.Cdr. H.M.R. Crichton, RN) and HMS Gladiolus (Lt.Cdr. H.M.C. Sanders, DSC, RNR). (3)

17 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Man o' War (T/Lt. W.W. Creber, RNR) and HMS Northern Dawn (Lt. G.P.S. Lowe, RNVR). (3)

18 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Douglas (Cdr. W.E. Banks, DSC, RN), HMS Man o' War (T/Lt. W.W. Creber, RNR) and HMS Chesterfield (Lt.Cdr. E. Gleave, RNR). (3)

24 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Londonderry for Falmouth. She was escorted by HMS St. Zeno (T/Lt. J.K. Craig, RNVR). (3)

26 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Falmouth. (4)

29 Mar 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Falmouth for her 2nd war patrol. She was ordered to patrol in the Bay of Biscay.

For the daily positions of HrMs O 10 during this patrol see the map below.

(5)

5 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) ended her 2nd war patrol at Plymouth. (5)

11 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Plymouth for Rothesay. She made the passage together with HrMs O 9 (Lt. H.A.W. Goossens, RNN) and HMS H 33 (Lt. C.H. Rankin, RN). They were escorted by the Free French minesweeper La Moqueuse. (4)

14 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Rothesay. (4)

18 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Rothesay for Londonderry. She was escorted by HMS Wellard (Lt.(Retd.) R.F. Turnbull RD, RNR). (4)

19 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Londonderry. (4)

22 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Sabre (Lt. Sir P.W. Gretton, DSC, RN), HMS Dianella (T/Lt. J.G. Rankin, RNR), HMS Kingcup (Lt. R.A.D. Cambridge, DSC, RNR) and HMS Sunflower (Lt.Cdr. J.T. Jones, RNR). (4)

23 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Keppel (Cdr. A.M. Sheffield, RN), HMS Douglas (Cdr. W.E. Banks, DSC, RN), HMS Roxborough (Lt. V.A. Wight-Boycott, OBE, RN), HMS Gladiolus (Lt.Cdr. H.M.C. Sanders, DSC, RNR), HMS Veronica (Lt.Cdr. (retired) D.F. White, RNR), HMS St. Elstan (T/Lt. G. Butcher, RNVR) and HMS Vizalma (T/Lt. M.M. Firth, RNVR). (4)

24 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Egret (A/Capt. E.M. Haes, RN) and HMS Verbena (Lt.Cdr. D.A. Rayner, DSC, RNVR). (4)

25 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (4)

28 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (4)

29 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (4)

30 Apr 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Clarkia (Lt.Cdr. F.J.G. Jones, RNR). (4)

1 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Newmarket (Lt.Cdr. G.B. O'Brien Harding, RN) and HMS Clarkia (Lt.Cdr. F.J.G. Jones, RNR). (4)

2 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (4)

6 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Kingcup (Lt. R.A.D. Cambridge, RNR), HMS Alisma (A/Lt.Cdr. M.G. Rose, RANVR), HMS Sabre (Lt. Sir P.W. Gretton, DSC, RN), HMS Keppel (Cdr. A.M. Sheffield, RN), HMS Fleetwood (Cdr. R.W. Moir, RN) and HMS Lincoln (Lt. R.J. Hanson, RN). (4)

7 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Vizalma (T/Lt. M.M. Firth, RNVR) and HMS Salisbury (Lt.Cdr. H.M.R. Crichton, RN). (4)

8 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Burnham (Cdr. J. Bostock, DSC, RN), HMS Salisbury (Lt.Cdr. H.M.R. Crichton, RN), HMS Eridge (Lt.Cdr. W.F.N. Gregory-Smith, RN), HMS St. Elstan (T/Lt. G. Butcher, RNVR), HMS Vizalma (T/Lt. M.M. Firth, RNVR), HMS Gladiolus (Lt.Cdr. H.M.C. Sanders, DSC, RNR) and HMS Veronica (Lt.Cdr.(Retd.) D.F. White, RNR). (4)

9 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Roxborough (Lt. V.A. Wight-Boycott, OBE, RN), HMS St. Elstan (T/Lt. G. Butcher, RNVR) and HMS St. Zeno (T/Lt. J.K. Craig, RNVR). (4)

11 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Skate (Lt. F.P. Baker, DSC, RN) and HMS Londonderry (Cdr. J.S. Dalison, RN). (4)

12 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Saladin (Lt.Cdr. L.J. Dover, RN) and HMS Sunflower (Lt.Cdr. J.T. Jones, RNR). (4)

15 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Sherwood (Lt.Cdr. S.W.F. Bennetts, RN) and HMS Dianella (T/Lt. J.G. Rankin, RNR) and aircraft.

In the early evening HrMs O 10 was hit by a practice bomb that damaged the pressure hull. The exercise was then cancelled and O 10 proceeded to Londonderry for repairs. (4)

18 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Beagle (Lt.Cdr. R.T. White, DSO and Bar, RN) and HMCS Columbia (Lt.Cdr.(Retd.) S.W. Davis, RN). (4)

19 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMCS Columbia (Lt.Cdr.(Retd.) S.W. Davis, RN) and HMCS St. Clair (Lt.Cdr. D.C. Wallace, RCNR). (4)

20 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMCS Eyebright (T/Lt. E. Randell, RCNR) and HMS Carnation (Lt.Cdr. G.W. Houchen, OBE, RNR). (4)

21 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMCS Eyebright (T/Lt. E. Randell, RCNR) and HMS Carnation (Lt.Cdr. G.W. Houchen, OBE, RNR). (4)

22 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMCS Eyebright (T/Lt. E. Randell, RCNR), HMS Carnation (Lt.Cdr. G.W. Houchen, OBE, RNR) and HMS Lady Madeleine (T/Lt. W.G. Ogden, RNVR). (4)

24 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Londonderry for Rothesay. She is escorted by HMS Northern Dawn (Lt. G.P.S. Lowe, RNVR). (4)

25 May 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Rothesay. (4)

2 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Rothesay to Campbeltown. (4)

3 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. A.F.C. Gray, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (4)

4 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN) and HMS Shemara (Cdr.(Retd.) H. Buckle, RN). (4)

5 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (4)

6 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. A.F.C. Gray, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (4)

7 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Cdr.(Retd.) W.A. Ford, RN) and HMS L' Atlantique (Skr. A. McKay, RNR). Upon completion of these exercises HrMs O 10 proceeded to Rothesay for engine repairs. (4)

11 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Rothesay to the Campbeltown area where she participated in A/S exercises together with HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (4)

12 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Cdr.(retired) W.A. Ford, RN) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (4)

13 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. A.F.C. Gray, RNR) and HMS Bedlington (Skr. J.H.D. Dansie, RNR). (4)

15 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Bedlington (Skr. J.H.D. Dansie, RNR). (4)

16 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN). (4)

17 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Cdr.(Retd.) W.A. Ford, RN) and HMS Valena (Lt.Cdr. A.F.C. Gray, RNR). (4)

18 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN). (4)

19 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) N.T.B. Holt, RN) and HMS Bretwalda (Skr. J. Windram, RNR). (4)

20 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Boarhound (Skr. S.G. Jinks, RNR). Upon completion of these exercises HrMs O 10 proceeded to Rothesay. (4)

21 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) was docked at Port Bannatyne. (4)

27 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) was undocked at Port Bannatyne. She then returned to Rothesay. (4)

30 Jun 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Rothesay to Tobermory. During this passage she was escorted by HMS Alecto (Cdr. R.M.G. Gambier, RN). (4)

1 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Balta (T/Lt. J.A.H. Punting, RNR) and HMS Norwich City (T/Lt. L.H. Stammers, RNVR). (4)

2 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Balta (T/Lt. J.A.H. Punting, RNR) and HMS Norwich City (T/Lt. L.H. Stammers, RNVR). (4)

4 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Balta (T/Lt. J.A.H. Punting, RNR), HMS Cotillion (A/Skr.Lt. J. Flett, RNR), HMS Polka (T/Lt. K.C. Donaldson, RNVR) and HMS Asie (Skr. F.C. Butler, RNR). (4)

5 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Asie (Skr. F.C. Butler, RNR), HMS Cotillion (A/Skr.Lt. J. Flett, RNR), FFS Alysse and HMS Minuet (T/Lt. A.M. Sullivan, RNVR). (4)

6 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with FFS Alysse, HMS Asie (Skr. F.C. Butler, RNR), HMS Polka (T/Lt. K.C. Donaldson, RNVR) and HMS Minuet (T/Lt. A.M. Sullivan, RNVR). (4)

7 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Asie (Skr. F.C. Butler, RNR), HMS Polka (T/Lt. K.C. Donaldson, RNVR), FFS Alysse and HMS Minuet (T/Lt. A.M. Sullivan, RNVR). (4)

9 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Polka (T/Lt. K.C. Donaldson, RNVR), HMS Le Tiger (T/Lt. C.A. Hoodless, RNR), HMS Brora (T/Lt. L.A. Enevoldson, RNVR) and HMS Flotta (T/Lt. G.L McArthur, RANVR). (4)

10 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Le Tiger (T/Lt. C.A. Hoodless, RNR), HMS Flotta (T/Lt. G.L McArthur, RANVR), HMS Brora (T/Lt. L.A. Enevoldson, RNVR) and HMS Cumbrae (T/Lt. C.E. Midwinter, RNR). (4)

11 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Brora (T/Lt. L.A. Enevoldson, RNVR), HMS Cumbrae (T/Lt. C.E. Midwinter, RNR), HMS Cava (T/Lt. A.M. Taylor, RNR) and HMS Flotta (T/Lt. G.L McArthur, RANVR). (4)

12 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Cava (T/Lt. A.M. Taylor, RNR), HMS Flotta (T/Lt. G.L McArthur, RANVR), HMS Romeo (T/Skr. W.R.H. Stewart, RNR) and HMS Minuet (T/Lt. A.M. Sullivan, RNVR). (4)

14 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Cava (T/Lt. A.M. Taylor, RNR), HMS Flotta (T/Lt. G.L McArthur, RANVR), HMS Le Tiger (T/Lt. C.A. Hoodless, RNR) and HMS Romeo (T/Skr. W.R.H. Stewart, RNR). (4)

15 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Le Tiger (T/Lt. C.A. Hoodless, RNR), HMS Cumbrae (T/Lt. C.E. Midwinter, RNR), HMS Samphire (Lt.Cdr. F.T. Renny, DSC, RNR) and HMS Romeo (T/Skr. W.R.H. Stewart, RNR). (4)

16 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Brora (T/Lt. L.A. Enevoldson, RNVR), HMS Flotta (T/Lt. G.L McArthur, RANVR), HMS Samphire (Lt.Cdr. F.T. Renny, DSC, RNR) and HMS Romeo (T/Skr. W.R.H. Stewart, RNR). (6)

17 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Flotta (T/Lt. G.L McArthur, RANVR), HMS Samphire (Lt.Cdr. F.T. Renny, DSC, RNR) and HMS Islay (Ch.Skr. T. Donovan, RNR). (6)

18 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Tobermory to Oban to embark fuel there. She was escorted by HMS Martinetta (T/Lt. J.A. Brightman, RNVR). (6)

19 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Oban to Tobermory. She was escorted by HMS Martinetta (T/Lt. J.A. Brightman, RNVR). (6)

21 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Samphire (Lt.Cdr. F.T. Renny, DSC, RNR), HMS Wells (Lt.Cdr. E.J. Lee, RN), HMS St. Marys (Lt. K.H.J.L. Phibbs, RN) and HMS Islay (Ch.Skr. T. Donovan, RNR). (6)

22 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Campion (Lt.Cdr. A. Johnson, RNVR) and HMS Islay (Ch.Skr. T. Donovan, RNR). (6)

23 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Campion (Lt.Cdr. A. Johnson, RNVR) and HMS Islay (Ch.Skr. T. Donovan, RNR). (6)

30 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Campion (Lt.Cdr. A. Johnson, RNVR), HMS Rothesay (Cdr. A.A. Martin, DSC, RD, RNR) and HMS Felixstowe (Lt.Cdr. C.H. Corbet-Singleton, DSC, RN). (6)

31 Jul 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Felixstowe (Lt.Cdr. C.H. Corbet-Singleton, DSC, RN), HMS Cape Palliser (T/Lt. G.E.P. Morris, RNR), HMS Rothesay (Cdr. A.A. Martin, DSC, RD, RNR) and FFS Senateur Duhamel. (6)

1 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Rothesay (Cdr. A.A. Martin, DSC, RD, RNR), FFS Senateur Duhamel, FFS Aconit and HMS Fara (Lt.Cdr. N.L. Pickersgill, RCNVR). (6)

2 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with FFS Aconit and HMS Fara (Lt.Cdr. N.L. Pickersgill, RCNVR). (6)

4 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Tobermory to Oban to embark fuel there. She was escorted by HMS Martinetta (T/Lt. J.A. Brightman, RNVR).

After embarking fuel she returned to Tobermory escorted by HMS Alecto (Cdr. R.M.G. Gambier, RN). (6)

7 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Wells (Lt.Cdr. E.J. Lee, RN) and HMS St. Marys (Lt. K.H.J.L. Phibbs, RN). (6)

8 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Wells (Lt.Cdr. E.J. Lee, RN) and HMS St. Marys (Lt. K.H.J.L. Phibbs, RN). (6)

10 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Narcissus (Lt. W.G.H. Bolton, RNR), HMS Stonecrop (A/Lt.Cdr. J.V. Brock, RCNVR), HMS Monkshood (Lt.Cdr. J.E.R. Wilford, RNR) and FFS Lobelia. (6)

11 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Monkshood (Lt.Cdr. J.E.R. Wilford, RNR), FFS Lobelia, HMS Stonecrop (A/Lt.Cdr. J.V. Brock, RCNVR) and HMS Kingston Agate (Lt. H.O. L’Estrange, RNR). (6)

12 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Tobermory together with HMS Kingston Agate (Lt. H.O. L’Estrange, RNR), HMS Hoxa (T/Lt. H.P Davies, RNR), HMS Kingston Amber (T/Lt. R.J. Kennedy, RNR) and HMS Wistaria (Skr. R.W. Denny, RNR). (6)

15 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) conducted RDF trials off Tobermory with HMS Stonecrop (A/Lt.Cdr. J.V. Brock, RCNVR).

Later the same day O 10 departed Tobermory for Blyth. She made the passage together with HMS H 31 (Lt. R.J. Hemingway, DSC, RN). They were escorted by HrMs Z 5 (Lt. J.J. Steensma, RNN). (6)

18 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Blyth. (6)

19 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) was docked at Blyth. (6)

28 Aug 1941
HrMs O 10 (Lt. J.H. Geijs, RNN) was undocked. (6)

4 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Blyth to Dundee. She was escorted by HMS Cutty Sark (Cdr.(Retd.) R.H. Mack, RN). (6)

8 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Dundee for Scapa Flow. She was escorted by HMS Cutty Sark (Cdr.(Retd.) R.H. Mack, RN). (6)

9 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Scapa Flow where she was to participate in A/S exercises. (6)

10 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Welshman (Capt. W.H.D. Friedberger, RN) and HMS Ashanti (Cdr. R.G. Onslow, RN). (6)

11 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Laforey (Capt. R.M.J. Hutton, DSO, RN), HMS Lamerton (Lt.Cdr. H.C. Simms, RN), HMS Ashanti (Cdr. R.G. Onslow, RN) and HMS Vivacious (Lt.Cdr. R. Alexander, RN). (6)

12 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Penelope (Capt. A.D. Nicholl, RN), HMS Ulster Queen (A/Capt. D.S. McGrath, RN), HMS Ashanti (Cdr. R.G. Onslow, RN) and HMS Castleton (Cdr.(Retd.) F.H.E. Skyrme, RN). (6)

13 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Badsworth (Lt.Cdr. M.S. Townsend, DSC and Bar, OBE, RN) and HMS Lamerton (Lt.Cdr. H.C. Simms, RN). (6)

15 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Anthony (Lt.Cdr. J.M. Hodges, RN), HMS Ashanti (Cdr. R.G. Onslow, RN) and HMS Vivacious (Lt.Cdr. R. Alexander, RN). (6)

16 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with aircraft. (6)

17 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Loch Tulla (Skr.Lt. H.L. Lang, DSC, RD, RNR) and HMS Regal (Skr. J.S. Harper, RNR). (6)

18 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Impulsive (Lt.Cdr. W.S. Thomas, DSC, RN). (6)

19 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Lancaster (A/Cdr. N.H. Whatley, RN) and HMS Vivacious (Lt.Cdr. R. Alexander, RN). (6)

20 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Lancaster (A/Cdr. N.H. Whatley, RN), HMS Bedouin (Cdr. B.G. Scurfield, OBE, RN) and HMS Lamerton (Lt.Cdr. H.C. Simms, RN). (6)

22 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Lancaster (A/Cdr. N.H. Whatley, RN), HMS Badsworth (Lt.Cdr. M.S. Townsend, DSC and Bar, OBE, RN) and HMS Escapade (Lt.Cdr. E.N.V. Currey, DSC, RN). (6)

23 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Matabele (Cdr. A.C. Stanford, DSC, RN), HMS Somali (Capt. D.K. Bain, RN) and later with HMS Invercairn, HMS Copious and HMS HDML 1022. (6)

24 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with vessels from the local defence. (6)

29 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Ibis (Lt.Cdr. H.M. Darell-Brown, RN). (6)

30 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with HMS Ibis (Lt.Cdr. H.M. Darell-Brown, RN). (6)

1 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Scapa Flow for passage to Rothesay. She made the passage together with HMS P 31 (Lt. J.B.de B. Kershaw, RN). They were escorted by HMS Cutty Sark (Cdr.(retired) R.H. Mack, RN).

At 1730/2, when of Oban harbour, O 10 left the other ships and proceeded towards Rothesay. She was now escorted by HrMs Z 5 (Lt. J.J. Steensma, RNN). (6)

3 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (6)

7 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Rothesay for Tobermory. She was escorted by HrMs Z 5 (Lt. J.J. Steensma, RNN). (6)

8 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Tobermory. (6)

9 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Moosejaw (Lt. F.E. Grubb, RCN) and HNoMS Montbretia. (6)

10 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HNoMS Montbretia and HMS Rysa (T/Lt. J.H. Cooper, RNVR). (6)

11 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMNZS Moa (Lt.Cdr. P.G. Connolly, DSC, RNZNVR) and HMS Visenda (T/Lt. S.F. Archer, RNR), HMCS Moosejaw (Lt. F.E. Grubb, RCN) and FFS Roselys. (6)

12 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Moosejaw (Lt. F.E. Grubb, RCN), FFS Roselys, FFS Commandant Detroyant and HNoMS Acanthus. (6)

14 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HNoMS Montbretia, HMS Visenda (T/Lt. S.F. Archer, RNR), FFS Commandant Detroyant and HNoMS Acanthus. (6)

15 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HNoMS Acanthus, FFS Commandant Detroyant, HMNZS Moa (Lt.Cdr. P.G. Connolly, DSC, RNZNVR) and HMS Peterhead (Lt. W.R. Tadman, RNR). (6)

16 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HNoMS Acanthus, FFS Commandant Detroyant, HMS Peterhead (Lt. W.R. Tadman, RNR) and HMS Poole (Lt. W.L.G. Dutton, RNR). (6)

17 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Peterhead (Lt. W.R. Tadman, RNR), HMS Poole (Lt. W.L.G. Dutton, RNR), HMNZS Moa (Lt.Cdr. P.G. Connolly, DSC, RNZNVR) and HMS Visenda (T/Lt. S.F. Archer, RNR). (6)

23 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Chicoutimi (T/Lt. W. Black, RCNR) and HMCS Coltsfoot (T/Lt. the Hon. W.K. Rous, RNVR). (6)

24 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted gunnery exercises off Tobermory. (6)

25 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Chicoutimi (T/Lt. W. Black, RCNR) and HMCS Coltsfoot (T/Lt. the Hon. W.K. Rous, RNVR). (6)

26 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Sherbrooke (Lt.Cdr. (retired) E.G.M. Donald, RN), HMCS Chicoutimi (T/Lt. W. Black, RCNR), HMS Leyland (Lt. G.M. Dixon, RANVR) and HMCS Coltsfoot (T/Lt. the Hon. W.K. Rous, RNVR). (6)

27 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMCS Chicoutimi (T/Lt. W. Black, RCNR) and HMCS Coltsfoot (T/Lt. the Hon. W.K. Rous, RNVR). (6)

28 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Tobermory to Oban. She was escorted by HMS Leyland (Lt. G.M. Dixon, RANVR). (6)

29 Oct 1941
After having embarked fuel at Oban, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), returned to Tobermory. (7)

1 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (7)

3 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (7)

4 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Hugh Walpole (T/Lt. P.O. Elliott, RNR) and HMS Stella Capella (Lt. W.L. Sadgrove, RANVR). (7)

5 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Pladda (T/Lt. P.T. Lovelock, DSC, RNVR) and HMS Shapinsay (A/Skr.Lt. W.S. Flowers, RNR). (7)

6 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Pladda (T/Lt. P.T. Lovelock, DSC, RNVR), HMS Shapinsay (A/Skr.Lt. W.S. Flowers, RNR), HMS Thyme (T/Lt. A.R. Mackay, RNZNVR) and HMS Lord Austin (Lt. N.P. McLeod, RNR). (7)

12 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (7)

15 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HrMs Jan van Brakel (Lt.Cdr. Baron T.K. van Asbeck, RNN) and HMCS Rosthern (Lt. W. Russell, RCNR). (7)

16 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HrMs Jan van Brakel (Lt.Cdr. Baron T.K. van Asbeck, RNN), HMCS Rosthern (Lt. W. Russell, RCNR), HMS Hildasay (T/Lt. W.P. Hart, RNR) and HMS Cape Argona (T/Lt. R.G. Wallace, RNR). (7)

17 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HrMs Jan van Brakel (Lt.Cdr. Baron T.K. van Asbeck, RNN) and HMCS Rosthern (Lt. W. Russell, RCNR). (7)

18 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Tobermory for Rothesay. She was escorted by HrMs Z 5 (Lt. J.J. Steensma, RNN). (7)

19 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (7)

29 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Rothesay to Campbeltown. As half of the crew of O 10 was still on leave they were replaced by men from the British spare crew of the Flotilla. (7)

30 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(retired) H. Buckle, RN) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (7)

1 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (7)

3 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR) and HMS Valena (Lt.Cdr. A.F.C. Gray, RNR). (7)

4 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. A.F.C. Gray, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (7)

5 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Carina (Cdr. (retired) T.St.V.F. Tyler, RN), HMS L' Atlantique (Skr. A. McKay, RNR), HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS Bretwalda (Skr. J. Windram, RNR). (7)

6 Dec 1941
The members of the English spare crew on board HrMs O 10 (Lt. Baron D.T. Mackay, RNN) were relieved by the Dutch crew when these returned from leave. (7)

7 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR), HMS Bretwalda (Skr. J. Windram, RNR) and HMS La Flore. (7)

8 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (7)

9 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J. Windram, RNR) and HMS Boarhound (Skr. S.G. Jinks, RNR). (7)

10 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (7)

11 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. A.F.C. Gray, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (7)

12 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Shemara (Cdr.(Retd.) H. Buckle, RN). (7)

14 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Spaniel (Skr. C. Coultas, DSC, RNR). (7)

15 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J. Windram, RNR) and HMS Boarhound (Skr. S.G. Jinks, RNR). (7)

16 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay. She made the passage together with HMS H 31 (Lt. F.B. Gibbs, RN). They were escorted by HMS L' Atlantique (Skr. A. McKay, RNR).

Later on the same day she departed Rothesay for her 3rd war patrol. She was ordered to patrol in the Bay of Biscay. Passage south through the Irish Sea was made together with HMS H 31 (Lt. F.B. Gibbs, RN) and HMS H 34 (Lt. W.A. Phillimore, RN). They were escorted by HMS Boarhound (Skr. S.G. Jinks, RNR) until 0700/17 when HMS Alecto (Cdr. R.M.G. Gambier, RN) took over the escort until 0500/19 while off Wolf Rock.

For the daily positions of HrMs O 10 during this patrol see the map below.

(2)

23 Dec 1941
At 1145 hours, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), made rendez-vous with HMS Cutty Sark (Cdr.(Retd.) R.H. Mack, RN) off Bishops Rock. Course was then set for Milford Haven. (2)

24 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Milford Haven for engine repairs. (2)

26 Dec 1941
With her engine repairs completed, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), departed Milford Haven to resume her 3rd war patrol. She was escorted by HMS Cutty Sark (Cdr. (retired) R.H. Mack, RN) until 0035/27. (2)

1 Jan 1942
At 0930 hours, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), made rendes-vous with HMS Otway (Lt.Cdr. (retired) J.R.G. Harvey, RN) and their escort towards Rothesay, HrMs Z 5 (Lt. J.J. Steensma, RNN). (2)

3 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) ended her 3rd war patrol at Rothesay. (2)

7 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardrossan. (7)

8 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was docked at Ardrossan. (7)

12 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was undocked. She then continued to make repairs at Ardrossan. (7)

1 Feb 1942
With her repairs completed, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), shifted from Ardrossan to Rothesay. (7)

3 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted trials off Rothesay. (7)

10 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted attack and gunnery exercises off Rothesay. Upon completion of these exercises she departed the Clyde area for her 4th war patrol. She was ordered to patrol in the Bay of Biscay. During passage south through the Irish Sea she was escorted by HMS Alecto (Cdr. R.M.G. Gambier, RN).

For the daily positions of HrMs O 10 during this patrol see the map below.

(7)

12 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) is ordered to proceed to Falmouth, her 4th war patrol was cancelled. (7)

13 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Falmouth. (7)

17 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN), HMS H 34 (Lt. R. Gatehouse, DSC, RN) and FFS Junon (Cdr. J. Querville) departed Falmouth for Rothesay. They were escorted by HMS Alecto (Cdr. R.M.G. Gambier, RN). (7)

19 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (7)

24 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN), HMS H 43 (Lt. R.B. Lakin, DSC, RN) and HMS Graph (Lt. E.D. Norman, DSO, DSC, RN) departed Rothesay / Holy Loch for Londonderry. They were escorted by HMS Northern Pride (T/Lt. A.R. Cornish, RNR). (7)

25 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Londonderry. (7)

27 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Sardonyx (Lt.Cdr. R.B.S. Tennant, RN) and HMS Scimitar (Lt.Cdr. R.D. Franks, OBE, RN). (7)

28 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Northern Spray (T/Lt. G.T. Gilbert, RNVR), HMS Saladin (Lt.Cdr. G.V. Legassick, RNR) and HMS Veteran (Cdr. W.E.J. Eames, DSC, RN). (7)

1 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Petunia (Lt.Cdr. J.M. Rayner, RD, RNR). (7)

2 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Watchman (Lt.Cdr. E.C.L. Day, RN) and HMS Walney (Lt.Cdr. P.C. Meyrick, RN). (8)

6 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HNoMS Newport (Cdr. R. Brusgaard, RNorN). (8)

7 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HNoMS Newport (Cdr. R. Brusgaard, RNorN) and HNoMS Lincoln (Cdr. A. Sorensen, RNorN). (8)

8 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was towed to a repair facilility in Londonderry to effect repairs as she was very difficult to steer. (8)

20 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Bulldog (Cdr. M. Richmond, OBE, RN) and HMS Richmond (Lt.Cdr. J.M. Rodgers, RN). (8)

21 Mar 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Lough Foyle together with HMS Bulldog (Cdr. M. Richmond, OBE, RN) and HMS Richmond (Lt.Cdr. J.M. Rodgers, RN). (8)

22 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Reading (Lt.Cdr. D.V. Clift, RN), HMS Richmond (Lt.Cdr. A.F.L. Evans, RN), HMCS Bittersweet (A/Lt.Cdr. J.A. Woods, RCNR) and HMCS Chilliwack (T/Lt. L.L. Foxall, RCNR). (8)

23 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMCS Bittersweet (A/Lt.Cdr. J.A. Woods, RCNR), HMCS Chilliwack (T/Lt. L.L. Foxall, RCNR) and HNoMS Newport (Cdr. R. Brusgaard, RNorN). (8)

24 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Rochester (Cdr. (retired) C.B. Allen, RN), HMS Bulldog (Cdr. M. Richmond, OBE, RN), HMS Ambuscade (Lt.Cdr. R.A. Fell, RN), HMS Sandwich (Lt.Cdr.(Emgy.) R.C. Gervers, RN), HMS Scarborough (Lt.Cdr. E.B. Carnduff, RN), HMS Bradford (Lt.Cdr. J.N.K. Knight, RN) and ORP Blyscawica (Lt.Cdr. T. Gorazdowski, ORP, ORP). (8)

25 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Ambuscade (Lt.Cdr. R.A. Fell, RN), ORP Blyscawica (Lt.Cdr. T. Gorazdowski, ORP, ORP), HMS Bulldog (Cdr. M. Richmond, OBE, RN) and aircraft. (8)

26 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with aircraft and HMS Corinthian (A/Cdr. E.J.R. Pollitt, RNR). (8)

28 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Primrose (Lt.Cdr. (retired) A. Ayre, RNR), HMS Viscount (Lt.Cdr. J.V. Waterhouse, RN) and HMS Corinthian (A/Cdr. E.J.R. Pollitt, RNR). (8)

29 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Dianella (T/Lt. J.G. Rankin, RNR), USS Bristol (Lt.Cdr. C.C. Wood, USN), HMS Kingcup (Lt.Cdr. R.A.D. Cambridge, DSC, RNR) and FFS Roselys. (8)

30 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Amazon (Lt.Cdr. (emergency) Lord Teynham, RN). (8)

31 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Amazon (Lt.Cdr. (emergency) Lord Teynham, RN) and HNoMS Bodo. (8)

2 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Monkshood (Lt.Cdr. J.E.R. Wilford, RNR), HMS Dahlia (T/Lt. M.S. Work, RNR), HMS Egret (Cdr. C.R.S. Farquhar, RN), HMS Fishguard (Lt.Cdr. H.L. Pryse, RNR) and HMS Arctic Explorer (T/Lt. C. Pawley, RNVR). (8)

3 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Arctic Explorer (T/Lt. C. Pawley, RNVR), HMS Beagle (Lt.Cdr. R.T. White, DSO and Bar, RN), USS Temptress (Lt.Cdr. W.H. Kirvan, USN) and USS Fury (Lt. N. Adair, Jr., USN). (8)

6 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with USS Temptress (Lt.Cdr. W.H. Kirvan, USN) and USS Ready (Lt. E.C. Woodward, USN) and USS Impulse (Lt. C.M. Lyons, Jr., USN). (8)

7 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Stork (Cdr. F.J. Walker, DSO, RN) and HMS Gardenia (T/Lt. C.J Jackson, RNVR). (8)

8 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with the Escort Group B 6 and later with HMS Salisbury (Lt.Cdr. M.H.R. Crichton, RN), USS Ready (Lt. E.C. Woodward, USN) and USS Impulse (Lt. C.M. Lyons, Jr., USN). (8)

9 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with the Escort Group B 3 and later with HMS Firedrake (Lt.Cdr. S.H. Norris, DSO, DSC, RN), FFS Lobelia, HMS Salisbury (Lt.Cdr. M.H.R. Crichton, RN) and HMS Vervain (Lt. H.P. Crail, RNR). (8)

10 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Georgetown (Lt.Cdr. P.G. MacIver, RNR), HMS Salisbury (Lt.Cdr. M.H.R. Crichton, RN), HMS Asphodel (Lt.Cdr.(Retd.) K.W. Stewart, RN), HMS Rockingham (Lt.Cdr. A.H.T. Johns, RN), USS Temptress (Lt.Cdr. W.H. Kirvan, USN) and USS Restless (Lt. E.C. Long, USN). (8)

11 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Georgetown (Lt.Cdr. P.G. MacIver, RNR) and HMS Anemone (Lt. R. Atkinson, DSC, RNR). (8)

14 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with USS Mayo (Lt.Cdr. I.T. Duke, USN), HNoMS Rose, HMS Venomous (Cdr. H.W. Falcon-Steward, RN), HMS Burwell (Lt.Cdr. S.R.J. Woods, RNR), HNoMS Acanthus, USS Simpson (Lt.Cdr. E.J. Burke, USN), HNoMS Potentilla and HNoMS Eglantine. (8)

15 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Venomous (Cdr. H.W. Falcon-Steward, RN), USCGC Campbell (Cdr. D.C. McNeil, USCG), HMS Winchelsea (Lt.Cdr. G.W. Gregorie, RNR).

16 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Winchelsea (Lt.Cdr. G.W. Gregorie, RNR), USCGC Campbell (Cdr. D.C. McNeil, USCG), USS Courage (Lt. C.S. Barker, Jr., USN) and USS Surprise (Lt. R.C.D. Hunt, Jr., USN). (8)

20 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) departed Londonderry for Rothesay. She was escorted by HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR). (8)

21 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Rothesay. (8)

25 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Rothesay to Campbeltown. (8)

26 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR) and HMS Bretwalda (Skr. J. Windram, RNR). (8)

27 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS Shemara (Cdr.(Retd.) H. Buckle, RN). (8)

28 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J. Windram, RNR) and HMS Boarhound (Skr. S.G. Jinks, RNR). (8)

29 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown. (8)

30 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN), HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS Palomares (A/Capt.(Retd.) J.H. Jauncey, RN). (8)

1 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR). (8)

3 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS L'Incomprise (Lt.Cdr. (retired) F.S. Deveson, RNR). (8)

4 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS Carina (Lt. R.A.H. Lord, RNR). (8)

5 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR). (8)

6 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR). (8)

7 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS Boarhound (Skr. S.G. Jinks, RNR). Upon completion of these exercises HrMs O 10 proceeded to Rothesay. (8)

13 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Rothesay for Lerwick. She made the passage together with HMS P 46 (Lt. J.S. Stevens, DSC, RN) and HMS P 614 (Lt. D.J. Beckley, RN). They were escorted by HrMs Jan van Gelder (Lt. P.L.M. van Geen, RNN). (8)

16 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Lerwick. (8)

18 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Lerwick for her 5th war patrol. She was ordered to patrol in the Norwegian Sea to provide cover during convoy operations to and from Northern Russia (convoys PQ 16 / QP 12).

For the daily positions of HrMs O 10 during this patrol see the map below.

(2)

1 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) ended her 5th war patrol at Lerwick. She departed Lerwick for Rothesay later the same day. She made the passage together with HMS P 614 (Lt. D.J. Beckley, RN). They were escorted by HMS La Capricieuse (Lt.Cdr. G.W. Dobson, RNR). (2)

5 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (9)

15 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig. At Ardishaig she participated in A/S exercises with ML's. (9)

16 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises O 10 proceeded to Campbeltown. (9)

17 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS Bretwalda (Skr. J. Windram, RNR). Upon completion of these exercises she proceeded to Ardishaig. (9)

18 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises O 10 proceeded to Campbeltown. (9)

19 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR). (9)

21 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN). Upon completion of these exercises she proceeded to Ardishaig. (9)

22 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises O 10 proceeded to Campbeltown. (9)

23 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J. Windram, RNR) and HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN). (9)

24 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Campbeltown to Ardishaig where participated in A/S exercises with ML's. Upon completion of these exercises O 10 proceeded to Campbeltown. (9)

25 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS Bedlington (Skr. J.H.D. Dansie, RNR). (9)

26 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR). After these exercises a practice attack was made on HMS Shemara (Cdr.(Retd.) H. Buckle, RN). O 10 then proceeded to Ardishaig. (9)

27 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises O 10 proceeded to Campbeltown. (9)

28 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR). (9)

29 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Spaniel. (9)

30 Jun 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR). (9)

1 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Spaniel. (9)

2 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS Spaniel. (9)

3 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS Bretwalda (Skr. J. Windram, RNR). (9)

5 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS Bretwalda (Skr. J. Windram, RNR). (9)

6 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Boarhound (Skr. S.G. Jinks, RNR). (9)

7 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR) and HMS Bedlington (Skr. J.H.D. Dansie, RNR). (9)

8 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Campbeltown to Ardishaig where participated in A/S exercises with ML's. (9)

9 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (9)

10 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. Upon completion of these exercises O 10 proceeded to Rothesay. (9)

15 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) proceeded to Port Bannatyne where she was immediately docked. (9)

17 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was undocked at Port Bannatyne. She then returned to Rothesay. (9)

18 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted engine trials off Rothesay. Upon completion of these she proceeded to Ardishaig. (9)

19 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (9)

20 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (9)

21 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. Upon completion of these she proceeded to Campbeltown. (9)

22 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS Bretwalda (Skr. J. Windram, RNR). (9)

23 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. S.G. Jinks, RNR) and HMS Spaniel. (9)

24 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. F.J. Webster, RNR) and HMS Boarhound (Skr. S.G. Jinks, RNR). Upon completion of these she proceeded to Rothesay. (9)

25 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted torpedo firing trials in Loch Long with 45 cm torpedoes from the USN. (9)

26 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted torpedo firing trials in Loch Long with 45 cm torpedoes from the USN. (9)

27 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted torpedo firing trials in Loch Long with 45 cm torpedoes from the USN. (9)

29 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted engine trials off Rothesay. Upon completion of these she proceeded to Campbeltown. (9)

30 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (9)

31 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS Bretwalda (Skr. J. Windram, RNR). (9)

2 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS Bretwalda (Skr. J. Windram, RNR). Following these A/S exercises O 10 participatd in an exercise in which she was taken in tow by HMS Bustler. (9)

3 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS La Cordeliere (A/Lt.Cdr. A.J.G. Barff, RNR). (9)

4 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Boarhound (Skr. S.G. Jinks, RNR). (9)

5 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS Bretwalda (Skr. J. Windram, RNR). (9)

6 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Emgy.) C.E. Lowther, RAN) and HMS Bretwalda (Skr. J. Windram, RNR). Upon completion of these exercises O 10 proceeded to Rothesay. (9)

8 Aug 1942
HMS H 28 (Lt. C.H. Rankin, RN) and HrMs O 10 (Lt. Baron D.T. Mackay, RNN) both departed Rothesay for Tobermory. They were escorted by HMS Z 5 (T/A/Lt.Cdr. S.T. Wenlock, RNR). (10)

11 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Dundee. (9)

14 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) departed Dundee for Blyth. She was escorted by HMS Nettle (Skr. F. Dale, RNR). (9)

15 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Blyth where she was to refit. (9)

1 Sep 1942
During her refit, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), was docked at Blyth. (9)

14 Dec 1942
During her refit, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), was undocked. (11)

23 Dec 1942
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted trials off Blyth. (11)

27 Dec 1942
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted trials off Blyth. (11)

3 Jan 1943
With her refit completed, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), departed Blyth for Dundee. She was escorted by HMS ML 454 (T/Lt. W.M. Russell, RNVR). (11)

4 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Dundee. (11)

6 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Dundee for Rothesay. She was escorted by HMS Loch Monteith (T/Lt. K.W. Richardson, RNR) until 1135/7 when HMS Leicester City (T/Lt. C.E. Irving, RNVR) took over the escort until 0921/8 when HMS Parrsboro (T/A/Lt.Cdr. C.C.L. Gaussen, RNVR) took over. (11)

9 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay. (11)

15 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Loch Goil where she conducted sound tests. (11)

16 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted sound tests at Loch Goil. Upon completion of these tests she returned to Rothesay. (11)

23 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig. (11)

24 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

25 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) returned to Rothesay because of a defect. (11)

26 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig where she participated in A/S exercises with ML's. (11)

27 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

28 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

29 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

31 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted independent exercises off Ardishaig. (11)

1 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

3 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (11)

4 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's in Kilbrannan Sound. Upon completion of these exercises she proceeded to Campbeltown. (11)

5 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (11)

7 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. J.H.D. Dansie, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (11)

8 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS Valena (Lt.Cdr. E. Gleave, RNR). (11)

9 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS Valena (Lt.Cdr. E. Gleave, RNR). (11)

10 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. A. Keable, RNR), HMS Spaniel and aircraft. (11)

11 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Valena (Lt.Cdr. E. Gleave, RNR) and HMS Bretwalda (Skr.Lt. J.R. Coultas, RD, RNR). (11)

13 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR). (11)

14 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr.Lt. J.R. Coultas, RD, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (11)

17 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay to repair a serious defect. (11)

23 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Rothesay for Tobermory. She was escorted by HMS Oxlip (Lt. C.W. Leadbetter, RNR). (11)

24 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Tobermory. (11)

25 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Itchen (Lt.Cdr.(Retd.) C.E. Bridgman, DSO, RNR) and HMS Charlestown (Lt. W.F.B. Webb, DSC, RN). (11)

26 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Itchen (Lt.Cdr.(Retd.) C.E. Bridgman, DSO, RNR) and HMS Charlestown (Lt. W.F.B. Webb, DSC, RN). (11)

27 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Teviot (Lt.Cdr. A. Blewett, DSC, RNR) and HMS Hayling. (T/Lt. G.B. Christie, RNR). (11)

28 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Oxlip (Lt. C.W. Leadbetter, RNR), HMS Snowdrop (Lt. P.A. Tinne, RNVR), HMS Wren (Lt.Cdr. R.M. Aubrey, RN) and HMS St. Marys (Lt. D.B.G. Dumas, RN). (11)

3 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Hyderabad (Lt. S.C.B. Hickman, DSC, RNR), HMS Prodigal (T/Lt. J.A.S. Leslie, RNR), HMS St. Marys (Lt. D.B.G. Dumas, RN) and HMS Grenadier (A/Skr.Lt. A.G. Day, RNR). (12)

4 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS St. Marys (Lt. D.B.G. Dumas, RN), HMS Grenadier (A/Skr.Lt. A.G. Day, RNR), HMS Wren (Lt.Cdr. R.M. Aubrey, RN) and HMS Rhododendron (Lt. L.A. Sayers, RNR). (12)

5 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Rhododendron (Lt. L.A. Sayers, RNR), HMS Teviot (Lt.Cdr. A. Blewett, DSC, RNR), HMS Hyderabad (Lt. S.C.B. Hickman, DSC, RNR) and HMS Prodigal (T/Lt. J.A.S. Leslie, RNR). (12)

6 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Teviot (Lt.Cdr. A. Blewett, DSC, RNR) and HMS Mutine (T/A/Lt.Cdr. N.E. Morley, DSC, RNVR). (12)

8 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Mutine (T/A/Lt.Cdr. N.E. Morley, DSC, RNVR). (12)

9 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Mutine (T/A/Lt.Cdr. N.E. Morley, DSC, RNVR), HMS Grenadier (A/Skr.Lt. A.G. Day, RNR) and HMS Rhododendron (Lt. L.A. Sayers, RNR). (12)

10 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Mutine (T/A/Lt.Cdr. N.E. Morley, DSC, RNVR) and HMS Lundy (T/Lt. S.J. Lavis, RNR). (12)

11 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Lundy (T/Lt. S.J. Lavis, RNR) and HMS Lady Sharazad. (12)

14 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Leeds United (A/Skr.Lt. W. Kirman, RNR). (12)

15 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Deveron (Lt.Cdr. R.E.H. Partington, RD, RNR), HMS Leeds United (A/Skr.Lt. W. Kirman, RNR) and HMS Derby County (Lt. K.B. Hopkins, DSC, RNVR). (12)

16 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Lady Madeleine (T/A/Lt.Cdr. N.S. Heriot, DSC, RNVR), HMS Derby County (Lt. K.B. Hopkins, DSC, RNVR) and HMS Deveron (Lt.Cdr. R.E.H. Partington, RD, RNR). (12)

17 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Kite (Lt.Cdr. W.F.R. Segrave, RN), HMS Lady Madeleine (T/A/Lt.Cdr. N.S. Heriot, DSC, RNVR), ML 166 and ML 574 (T/S.Lt. E.R.S. Gillham, RNVR). (12)

19 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Derby County (Lt. K.B. Hopkins, DSC, RNVR), HMS Lancer (A/Skr.Lt. A. Robinson, DSC, RNR) and HMS Deveron (Lt.Cdr. R.E.H. Partington, RD, RNR). (12)

20 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Derby County (Lt. K.B. Hopkins, DSC, RNVR), HMS Kite (Lt.Cdr. W.F.R. Segrave, RN) and HMS Wild Goose (Cdr. D.E.G. Wemyss, RN). (12)

21 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Kite (Lt.Cdr. W.F.R. Segrave, RN), HMS Wild Goose (Cdr. D.E.G. Wemyss, RN), HMS Trent (T/A/Lt.Cdr. J.G. Rankin, DSC, RNR) and HMIS Rohilkhand (Lt. J.E. Gibbs, RIN). (12)

22 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMIS Rohilkhand (Lt. J.E. Gibbs, RIN), HMS Leeds United (A/Skr.Lt. W. Kirman, RNR) and HMS Wild Goose (Cdr. D.E.G. Wemyss, RN). (12)

25 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Deveron (Lt.Cdr. R.E.H. Partington, RD, RNR) and HMS Trent (T/A/Lt.Cdr. J.G. Rankin, DSC, RNR). (12)

26 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Trent (T/A/Lt.Cdr. J.G. Rankin, DSC, RNR) and HMS Lancer (A/Skr.Lt. A. Robinson, DSC, RNR). (12)

27 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Trent (T/A/Lt.Cdr. J.G. Rankin, DSC, RNR), HMS Lancer (A/Skr.Lt. A. Robinson, DSC, RNR), HMS Wild Goose (Cdr. D.E.G. Wemyss, RN) and HMS Duncan (Cdr. Sir P.W Gretton, DSO, DSC, OBE, RN). (12)

28 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Tobermory together with HMS Wild Goose (Cdr. D.E.G. Wemyss, RN), HMS Duncan (Cdr. Sir P.W Gretton, DSO, DSC, OBE, RN) and HMS Lady Sharazad. (12)

29 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Tobermory for Campbeltown. She was escorted by HMS Lancer (A/Skr.Lt. A. Robinson, DSC, RNR). (12)

30 Mar 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived off Campbeltown. New orders were issued and she was now ordered to proceed to Rothesay. (12)

4 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) proceeded from Rothesay to Arrochar. (12)

5 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted torpedo discharge trials off Arrochar. (12)

6 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted torpedo discharge trials off Arrochar. (12)

7 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted torpedo discharge trials off Arrochar. (12)

8 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted torpedo discharge trials off Arrochar. (12)

9 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted noise trials in Loch Goil. Upon completion of these she returned to Rothesay. (12)

14 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (12)

15 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (12)

16 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (12)

19 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) Shifted from Rothesay to Ardishaig. (12)

20 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (12)

21 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (12)

22 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises she returned to Rothesay. (12)

30 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Rothesay for Lerwick. She made the passage together with HMS Truculent (Lt.Cdr. R.L. Alexander, RN), HMS Ultimatum (Lt. W.H. Kett, RNR) and HNoMS Ula (Lt. R.M. Sars). They were escorted by HMS Dornoch (Lt. H.E. Jackson, RN). (12)

3 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Lerwick. (12)

4 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Lerwick for her 6th war patrol. She was ordered to patrol in the Norwegian Sea, an anti-Uboat patrol.

For the daily positions of HrMs O 10 during this patrol see the map below.

(2)

5 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived in her patrol area. (2)

13 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) developed serious engine defects. The port air compressor malfunctioned resulting in the port diesel engine being inoperative. O 10 reported this and she was ordered to return to Lerwick. Shortly afterwards however the starboard air compressor also malfunctioned. O 10 now was without diesel propulsion. O 10 then continued towards Lerwick submerged. (2)

14 May 1943
At 0340 hours, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), was spotted by a Catalina that was sent out to search for her. Around 0600 hours HMS Chiddingfold (Lt. T.M. Dorrien-Smith, RN) came in sight. Late in the morning they were joined by HMS Brecon (Lt.Cdr. T.D. Herrick, DSC and Bar, RN), HMS Brissenden (Lt. D.C. Beatty, RN) and HMS Celia (T/Lt. L.B. Merrick, RNR). HMS Brecon then took O 10 in tow. Around 1600 hours HMS Halcyon (Lt.Cdr. C.H. Corbet-Singleton, RN) arrived which took over the tow. (2)

16 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) ended her 6th war patrol when she arrived at Lerwick. (2)

23 May 1943
After repairs, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) departed Lerwick for the Clyde. She made the passage together with HMS Surf (Lt. D. Lambert, DSC, RN). They were escorted by HMS La Capricieuse (Lt.Cdr. G.W. Dobson, RNR). (13)

25 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay. (13)

15 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Kames Bay where she was immediately docked. (13)

20 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked at Kames Bay. After a trial dive she returned to Rothesay. (13)

26 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig. (13)

27 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

28 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

29 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

30 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises she proceeded to Campbeltown. (13)

1 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr.Lt. J.R. Coultas, RD, RNR), HMS L' Atlantique (Skr. A. McKay, RNR) and aircraft. (13)

2 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

3 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay. (13)

9 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Kames Bay where she was immediately docked. (13)

12 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked at Kames Bay. She then proceeded to Campbeltown. (13)

13 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Spaniel. (13)

14 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (13)

15 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR) and HMS Bretwalda (Skr.Lt. J.R. Coultas, RD, RNR). (13)

16 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR) and HMS Spaniel. (13)

18 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Ardishaig. (13)

19 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

20 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

21 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (13)

22 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises she proceeded to Campbeltown. (13)

23 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR). (13)

25 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR). (13)

26 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

27 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with ships and aircraft. These included night execises during the night of 27/28 July 1943. (13)

28 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS Spaniel. (13)

29 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR), HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR) and aircraft. (13)

30 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR) and HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR). (13)

1 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

2 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR), HMS Boarhound (Skr. A. Keable, RNR) and aircraft. (13)

3 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (Retd.) H. Buckle, RN) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

4 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr. (retired) F.S. Deveson, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

5 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. A. Keable, RNR) and HMS Spaniel. (13)

6 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR). (13)

7 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay. (13)

8 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Rothesay to Ardishaig. (13)

9 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (13)

10 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (13)

11 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (13)

12 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (13)

13 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises she proceeded to Campbeltown. (13)

16 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR). (13)

17 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr.Lt. J.R. Coultas, RD, RNR) and HMS L' Atlantique (Skr. A. McKay, RNR). (13)

18 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel. (13)

19 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS Radiant (T/Lt. C.S.R. Shapland, RNVR). (13)

20 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr. (retired) F.S. Deveson, RNR) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

22 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Altair (Lt.Cdr. (retired) W.R.T. Clements, RNR). (13)

23 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

24 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

25 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR). (13)

26 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR). (13)

27 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN). (13)

29 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS L'Incomprise (Lt.Cdr.(Retd.) F.S. Deveson, RNR) and HMS Shemara (Cdr.(Retd.) H. Buckle, RN). (13)

30 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

31 Aug 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR) and HMS Bedlington (Skr. A.W. Peak, RNR). (13)

1 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

2 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Boarhound (Skr. A. Keable, RNR). (13)

3 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Bedlington (Skr. A.W. Peak, RNR). (13)

5 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR). (13)

6 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR) and HMS Spaniel. (13)

7 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Boarhound (Skr. A. Keable, RNR). (13)

8 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

9 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR), HMS Altair (Lt.Cdr.(Retd.) W.R.T. Clements, RNR) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR). (13)

10 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

12 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. A. McKay, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

13 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (Retd.) H. Buckle, RN) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR). (13)

14 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, RD, RNR). (13)

15 Sep 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Campbeltown to Rothesay. (13)

1 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Rothesay to Greenock where she embarked diesel fuel. She then shifted from Greenock to Campbeltown. (13)

3 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. A. Keable, RNR) and HMS Spaniel. (13)

4 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

5 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

6 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel, HMS Boarhound (Skr. A. Keable, RNR), HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS Radiant (T/Lt. C.S.R. Shapland, RNVR). (13)

7 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Boarhound (Skr. A. Keable, RNR). (13)

8 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (13)

10 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

11 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Spaniel. (13)

12 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Carina (Lt. R.A.H. Lord, RNR) and HMS Spaniel. (13)

13 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Spaniel. (13)

14 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR) and HMS Spaniel. (13)

17 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Shemara (Cdr. (retired) H. Buckle, RN). (13)

18 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/Lt. C.S.R. Shapland, RNVR) and HMS Spaniel. (13)

19 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS Spaniel. (13)

20 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS Spaniel. (13)

21 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN) and HMS Spaniel. (13)

22 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Altair (Lt.Cdr. (retired) W.R.T. Clements, RNR) and HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR). (13)

24 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel. (13)

25 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr. (retired) H. Buckle, RN). (13)

26 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR). (13)

27 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Altair (Lt.Cdr. (retired) W.R.T. Clements, RNR) and HMS Radiant (T/Lt. C.S.R. Shapland, RNVR). (14)

28 Oct 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

1 Nov 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Campbeltown to Rothesay. (14)

2 Dec 1943
After a repair period of about a month, HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)), conducted trials in the Clyde area. (14)

3 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) departed Rothesay for Londonderry. She was escorted by HMS Blade (T/A/Lt.Cdr. S.T. Wenlock, RNR). (14)

4 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) arrived at Londonderry. (14)

5 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Towy (Cdr. M.J Evans, OBE, RN), ORP Burza (Cdr. F. Pitulko, ORP) and FFS Lobelia. (14)

6 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with Escort Group B3 and later with HMS Inver (Lt.Cdr. F.H. Gray, RNR). (14)

10 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with aircraft. (14)

11 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Watchman (Lt.Cdr. G.H.D. Williams, RN) and HMS Goathland (Lt.Cdr. B.G.B. Bordes, DSC, RN). (14)

12 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Watchman (Lt.Cdr. G.H.D. Williams, RN) and HMS Goathland (Lt.Cdr. B.G.B. Bordes, DSC, RN). (14)

14 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMCS Rimouski (T/Lt. R.J. Pickford, RCNVR) and HMCS Eyebright (T/Lt. H.L. Quinn, RCNVR). (14)

15 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Wallflower (Lt. G.R. Greaves, RNR). (14)

16 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMCS Summerside (T/Lt. G. St. A.Mongenais, RCNVR) and HMS Hurricane (Cdr. C.E.E. Paterson, RN). (14)

17 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Wallflower (Lt. G.R. Greaves, RNR). (14)

23 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMCS Snowberry (T/Lt. J.A. Dunn, RCNVR) and HMS Tweed (Lt.Cdr. R.S. Miller, DSC, RNR). (14)

24 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Nene (Cdr. J.D. Birch, RD, RNR) and HMCS Snowberry (T/Lt. J.A. Dunn, RCNVR). (14)

25 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Mignonette (Lt. H.H. Brown, DSC, RNR). (14)

28 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Snowflake (Lt. E.J. Powell, RNR) and HMS Loosestrife (Lt. H.A. Stonehouse, DSC, RNR). (14)

29 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Winchelsea (Lt. C.T. Shuttleworth, RNVR) and another Royal Navy ship (unable to read the name in the log of O 10). (14)

30 Dec 1943
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Skate (Lt. J.C. Rushbrooke, DSC, RN), HMS Saladin (T/A/Lt.Cdr. P.G.C. King, RNVR), HMS Chelsea (Lt.Cdr. J.E.R. Wilford, RNR) and HMS Burdock (T/Lt. F.R.M. Greasley, RNR). (14)

5 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Watchman (Lt.Cdr. G.H.D. Williams, RN), HMS Kenilworth Castle (Lt. J.J.Allon, RNR) and HMS Woodpecker (Cdr. H.L. Pryse, RNR). (14)

6 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Kenilworth Castle (Lt. J.J.Allon, RNR) and HMS Ettrick (T/A/Lt.Cdr. N.J.T. Monsarrat, RNVR). (14)

7 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Ettrick (T/A/Lt.Cdr. N.J.T. Monsarrat, RNVR), HMCS Galt (T/Lt. A.M. Kirkpatrick, RCNVR), HMS Kenilworth Castle (Lt. J.J.Allon, RNR), HMS Berkeley Castle (T/Lt. F.A. Darrah, RNVR). (14)

8 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Lough Foyle together with HMS Carisbrooke Castle (T/Lt. W.H. Forster, RNR). (14)

11 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Londonderry to Rothesay. She was escorted by HMS Kihna (A/Cdr.(Retd.) A.R.W. Sayle, RD, RNR). (14)

19 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) was docked at Port Bannatyne. (14)

23 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) was undocked at Port Bannatyne. She immediately returned to Rothesay (which was 'just round the corner'). (14)

28 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) departed Rothesay for Tobermory. She was escorted by HMS Blade (T/A/Lt.Cdr. S.T. Wenlock, RNR). (14)

29 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) arrived at Tobermory after having embarked fuel at Oban. (14)

30 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Windermere (Skr. T. Williamson, RNR). (14)

31 Jan 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Recruit (T/Cdr. G.E.W.W. Bayly, RNVR) and HMS Fancy (A/Lt.Cdr. G.A. Simmers, DSC, RNR). (14)

1 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Recruit (T/Cdr. G.E.W.W. Bayly, RNVR), HMS Fancy (A/Lt.Cdr. G.A. Simmers, DSC, RNR), HMS Fort York (T/Lt. E.W. De la Mare, RNR) and HMS Steepholm (T/Lt. S.C. Dickenson, RNVR). (14)

2 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Steepholm (T/Lt. S.C. Dickenson, RNVR), HMS Recruit (T/Cdr. G.E.W.W. Bayly, RNVR) and HMS Fancy (A/Lt.Cdr. G.A. Simmers, DSC, RNR). (14)

7 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Lady Sharazad (Lt.Cdr. W.C. Shepherd, RNR). (14)

10 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Gateshead (T/Lt. R.B. Hughes, RNVR). (14)

11 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Dittany (T/Lt. S.W. Lock, RNVR) and HMS Gateshead (T/Lt. R.B. Hughes, RNVR). (14)

12 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Tobermory with HMS Dittany (T/Lt. S.W. Lock, RNVR) and HMS Gateshead (T/Lt. R.B. Hughes, RNVR). (14)

16 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) departed Tobermory for Stornoway. She was escorted by HMS Kihna (A/Cdr. (Retd.) A.R.W. Sayle, RD, RNR). (14)

17 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) arrived at Stornoway. (14)

18 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Ailsa Craig (T/Lt. T.G. Hornsby, RNR). (14)

19 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Ailsa Craig (T/Lt. T.G. Hornsby, RNR). (14)

21 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Ailsa Craig (T/Lt. T.G. Hornsby, RNR). (14)

25 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HNoMS Namsos. (14)

27 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HNoMS Namsos. (14)

28 Feb 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HNoMS Namsos. (14)

1 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Caldy (T/Lt. G.D. Cowley, RNVR) and HMS Flint Castle (T/Lt. N. Harrison, RNVR). (14)

2 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Caldy (T/Lt. G.D. Cowley, RNVR). (14)

4 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Caldy (T/Lt. G.D. Cowley, RNVR). (14)

6 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Caldy (T/Lt. G.D. Cowley, RNVR), HMS Flint Castle (T/Lt. N. Harrison, RNVR) and HMS Crowlin (A/Skr.Lt. A. Smith, RNR). (14)

8 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Benbecula (T/A/Lt.Cdr. A.F.W. Boumphrey, RNVR), HMS Arcturus (T/Lt. H.R. Grief, RNR), HMS Flint Castle (T/Lt. N. Harrison, RNVR) and HMS Crowlin (A/Skr.Lt. A. Smith, RNR). (14)

9 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Benbecula (T/A/Lt.Cdr. A.F.W. Boumphrey, RNVR), HMS Arcturus (T/Lt. H.R. Grief, RNR) and HMS Crowlin (A/Skr.Lt. A. Smith, RNR). (14)

11 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Benbecula (T/A/Lt.Cdr. A.F.W. Boumphrey, RNVR) and HMS Flint Castle (T/Lt. N. Harrison, RNVR). (14)

12 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Stornoway with HMS Persian (Lt.Cdr. A. Ecclestone, RN) and HMS Flint Castle (T/Lt. N. Harrison, RNVR). (14)

13 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated departed Stornoway for Rothesay via Londonderry. She was escorted by HMS Persian (Lt.Cdr. A. Ecclestone, RN) until 0734/14 when HMS Blade (T/A/Lt.Cdr. S.T. Wenlock, RNR) took over the escort when off Oban. (14)

15 Mar 1944
HMS H 34 (Lt. R.L. Jay, RN) and HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) both departed Londonderry for Rothesay where they arrived later the same day. They were escorted by HMS Blade (T/A/Lt.Cdr. S.T. Wenlock, RNR). (15)

16 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) arrived at Rothesay. (14)

30 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Rothesay to Ardishaig. (14)

31 Mar 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

2 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

3 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

4 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

5 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

6 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

7 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

10 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

11 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. (14)

12 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises with ML's off Ardishaig. Upon completion of these exercises she proceeded to Campbeltown. (14)

16 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR) and HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR). (14)

17 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR) and HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR). (14)

19 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with US warships. (14)

20 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

21 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Bedlington (Skr. A.W. Peak, RNR). (14)

24 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

25 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

26 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR) and HMS Boarhound (Skr. A. Keable, RNR).

27 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bedlington (Skr. A.W. Peak, RNR) and HMS L' Atlantique (Skr. H. Crighton, RNR). (14)

28 Apr 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and another vessel. (14)

8 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr. (retired) H.T. Pitt, RN) and HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR). (14)

9 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

10 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Boarhound (Skr. A. Keable, RNR) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (14)

12 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS L' Atlantique (Skr. C.A. Collins, RNR). (14)

14 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS L' Atlantique (Skr. C.A. Collins, RNR). (16)

17 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR) and HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR). (16)

18 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Keppel (Cdr. I.J. Tyson, DSC, RD, RNR), HMS Wrestler (Lt.Cdr. R.W.B. Lacon, DSC, RN) and aircraft. (16)

21 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Buttercup (T/A/Lt.Cdr. J. Hunter, RNR) and HNoMS Rose (Lt. L.R. Lund, RNorN). (16)

22 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR) and HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR). (16)

23 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR) and HMS Spaniel. (16)

26 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Boarhound (Skr. A. Keable, RNR). (16)

28 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (16)

29 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (16)

30 May 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. C.A. Collins, RNR) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (16)

2 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR). (16)

4 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Radiant (T/A/Lt.Cdr. C.S.R. Shapland, RNVR). (16)

5 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Tuscarora (Lt.Cdr.(Retd.) H.T. Pitt, RN) and HMS Bretwalda (Skr. J.B. Henderson, RNR). (16)

6 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR) and HMS Boarhound (Skr. A. Keable, RNR). (16)

7 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR). (16)

12 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS La Cordeliere (Lt.Cdr. A.J.G. Barff, RNR) and HMS L' Atlantique (Skr. C.A. Collins, RNR). (16)

13 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Spaniel and HMS Boarhound (Skr. A. Keable, RNR). (16)

14 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR). (16)

16 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR) and HMS Spaniel. (16)

18 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR). (16)

19 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS St. Modwen (Lt.Cdr. J.M. Lycett, DSC, RNR). (16)

20 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Shemara (Cdr.(Retd.) H. Buckle, RN) and HMS Spaniel. (16)

21 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) conducted exercises off Campbeltown with HrMs O 9 (Lt. R.W. van Lynden, RNN). (16)

22 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) and HMS Upshot (Lt. H.W. Wilkinson, RN) both conducted attack exercises off Campbeltown during which they served as target for each other. (17)

25 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Altair (T/Lt. J.L. James, RNR). (16)

26 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown. (16)

27 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS L' Atlantique (Skr. C.A. Collins, RNR). (16)

28 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown. (16)

29 Jun 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Bretwalda (Skr. J.B. Henderson, RNR). (16)

2 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown. (16)

3 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown with HMS Valena (T/A/Lt.Cdr. A. McKinlay, RNR), HMS Bedlington (Skr. A.W. Peak, RNR) and HMS Uther (Lt. R.A.A.C. Ward, DSC, RN). (16)

5 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown. (16)

7 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) participated in A/S exercises off Campbeltown. (16)

8 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) shifted from Campbeltown to Rothesay. (16)

14 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) was docked at Port Bannatyne. (16)

18 Jul 1944
HrMs O 10 (Lt.Cdr. A. van Altena, RNN(R)) was undocked at Port Bannatyne. She immediately returned to Rothesay. (16)

28 Jul 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) conducted exercises in the Clyde area. (16)

31 Jul 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) conducted exercises in the Clyde area. (16)

2 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) departed Rothesay for Londonderry. She was escorted by HMS Kihna (Cdr.(Retd.) T.J.T.C. Jenks, RN). (16)

3 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) arrived at Londonderry. She had arrived at Londonderry with engine defects. (16)

17 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (16)

18 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) participated in A/S exercises off Lough Foyle together with aircraft. (16)

21 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) conducted exercises off Lough Foyle. (16)

22 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) participated in A/S exercises off Lough Foyle together with HMS Oxford Castle (T/Lt. H.E. Holden, DSC, RNR) and aircraft. (16)

23 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) conducted exercises off Lough Foyle. (16)

24 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) participated in A/S exercises off Lough Foyle together with HMS Bazely (A/Lt.Cdr.(Retd.) J.W. Cooper, RNR), HMS Calder (T/A/Lt.Cdr. E. Playne, RNVR) and HMS Pasley (Lt. P.G.R. Mitchell, RN). (16)

26 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) conducted trials with American ammunition for her 8.8cm gun. (16)

29 Aug 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) participated in A/S exercises off Lough Foyle together with aircraft. HrMs O 10 ended the day with more engine defects. (16)

15 Sep 1944
Not being fit fur further A/S running, HrMs O 10 (Lt. S.H. de Boer, RNN), departed Londonderry for Rothesay. She was escorted by HMS Loch Tulla (A/Ch.Skr. J. Flett, RNR). (16)

16 Sep 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) arrived at Rothesay. (16)

2 Oct 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) departed Rothesay for Dundee. She made the passage together with HrMs O 9 (Lt.Cdr. J.B.M.J. Maas, RNN). They were escorted by HNoMS Narvik. (16)

8 Oct 1944
HrMs O 10 (Lt. S.H. de Boer, RNN) arrived at Dundee. (16)

11 Oct 1944
Being unfit for further service, HrMs O 10 (Lt. S.H. de Boer, RNN), was decommissioned and laid up at Dundee. (16)

27 Jun 1945
O 10 departed Dundee for Rotterdam. (18)

30 Jun 1945
O 10 arrived at Rotterdam where she was used to provide electrical power. (18)