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Submarine HNMS O 10 (P 10)

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). (1)

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). (1)

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. (1)

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). (1)

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). (1)

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). (1)

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). (1)

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). (1)

16 Sep 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Scapa Flow with aircraft. (1)

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). (1)

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). (1)

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). (1)

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). (1)

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). (1)

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. (1)

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. (1)

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). (1)

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). (1)

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). (1)

3 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (1)

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). (1)

8 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Tobermory. (1)

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. (1)

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). (1)

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. (1)

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. (1)

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. (1)

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). (1)

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). (1)

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). (1)

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). (1)

24 Oct 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted gunnery exercises off Tobermory. (1)

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). (1)

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). (1)

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). (1)

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). (1)

29 Oct 1941
After having embarked fuel at Oban, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), returned to Tobermory. (2)

1 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (2)

3 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (2)

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). (2)

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). (2)

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). (2)

12 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted exercises off Tobermory. (2)

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). (2)

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). (2)

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). (2)

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). (2)

19 Nov 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (2)

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. (2)

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). (2)

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). (2)

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). (2)

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). (2)

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). (2)

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. (2)

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. (2)

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). (2)

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). (2)

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). (2)

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). (2)

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). (2)

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). (2)

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). (2)

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.

(3)

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. (3)

24 Dec 1941
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Milford Haven for engine repairs. (3)

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. (3)

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). (3)

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

7 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardrossan. (2)

8 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was docked at Ardrossan. (2)

12 Jan 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was undocked. She then continued to make repairs at Ardrossan. (2)

1 Feb 1942
With her repairs completed, HrMs O 10 (Lt. Baron D.T. Mackay, RNN), shifted from Ardrossan to Rothesay. (2)

3 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) conducted trials off Rothesay. (2)

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.

(2)

12 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) is ordered to proceed to Falmouth, her 4th war patrol was cancelled. (2)

13 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Falmouth. (2)

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). (2)

19 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Rothesay. (2)

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). (2)

25 Feb 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Londonderry. (2)

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). (2)

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). (2)

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). (2)

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). (4)

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). (4)

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). (4)

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. (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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. (4)

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). (4)

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). (4)

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. (4)

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). (4)

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. (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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. (4)

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). (4)

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). (4)

21 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) arrived at Rothesay. (4)

25 Apr 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) shifted from Rothesay to Campbeltown. (4)

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). (4)

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). (4)

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). (4)

29 Apr 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Campbeltown. (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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). (4)

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. (4)

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). (4)

16 May 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Lerwick. (4)

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.

(3)

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). (3)

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

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. (5)

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. (5)

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. (5)

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. (5)

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). (5)

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. (5)

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. (5)

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). (5)

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. (5)

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). (5)

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. (5)

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. (5)

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). (5)

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. (5)

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). (5)

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. (5)

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. (5)

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). (5)

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). (5)

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). (5)

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). (5)

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. (5)

9 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (5)

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. (5)

15 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) proceeded to Port Bannatyne where she was immediately docked. (5)

17 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) was undocked at Port Bannatyne. She then returned to Rothesay. (5)

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. (5)

19 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (5)

20 Jul 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) participated in A/S exercises off Ardishaig with ML's. (5)

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. (5)

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). (5)

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. (5)

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. (5)

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. (5)

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. (5)

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. (5)

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. (5)

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). (5)

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). (5)

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. (5)

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). (5)

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). (5)

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). (5)

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. (5)

11 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Dundee. (5)

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). (5)

15 Aug 1942
HrMs O 10 (Lt. Baron D.T. Mackay, RNN) arrived at Blyth where she was to refit. (5)

1 Sep 1942
During her refit, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), was docked at Blyth. (5)

14 Dec 1942
During her refit, HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN), was undocked. (6)

23 Dec 1942
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted trials off Blyth. (6)

27 Dec 1942
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted trials off Blyth. (6)

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). (6)

4 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Dundee. (6)

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. (6)

9 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay. (6)

15 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Loch Goil where she conducted sound tests. (6)

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. (6)

23 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig. (6)

24 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

25 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) returned to Rothesay because of a defect. (6)

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. (6)

27 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

28 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

29 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

31 Jan 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted independent exercises off Ardishaig. (6)

1 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

3 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (6)

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. (6)

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). (6)

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). (6)

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). (6)

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). (6)

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. (6)

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). (6)

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). (6)

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). (6)

17 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay to repair a serious defect. (6)

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). (6)

24 Feb 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Tobermory. (6)

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). (6)

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). (6)

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). (6)

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). (6)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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. (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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). (7)

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. (7)

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). (7)

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. (7)

4 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) proceeded from Rothesay to Arrochar. (7)

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

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

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

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

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. (7)

14 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (7)

15 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (7)

16 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises in the Clyde area. (7)

19 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) Shifted from Rothesay to Ardishaig. (7)

20 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (7)

21 Apr 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (7)

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. (7)

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). (7)

3 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Lerwick. (7)

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.

(3)

5 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived in her patrol area. (3)

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. (3)

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. (3)

16 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) ended her 6th war patrol when she arrived at Lerwick. (3)

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). (8)

25 May 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay. (8)

15 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Kames Bay where she was immediately docked. (8)

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. (8)

26 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Ardishaig. (8)

27 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

28 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

29 Jun 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

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. (8)

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. (8)

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). (8)

3 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay. (8)

9 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Rothesay to Kames Bay where she was immediately docked. (8)

12 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked at Kames Bay. She then proceeded to Campbeltown. (8)

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. (8)

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). (8)

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). (8)

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. (8)

18 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Ardishaig. (8)

19 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

20 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

21 Jul 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) participated in A/S exercises with ML's off Ardishaig. (8)

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. (8)

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). (8)

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). (8)

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). (8)

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. (8)

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. (8)

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. (8)

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). (8)

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). (8)

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. (8)

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). (8)

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). (8)

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. (8)

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). (8)

7 Aug 1943
HrMs O 10 (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Campbeltown to Rothesay. (8)

Submarine HNMS Zeehond (N 73)

31 Oct 1943
With her refit completed HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) shifted from Plymouth to Portsmouth. (9)

11 Nov 1943
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Portsmouth for the Clyde. She made the passage together with HMS Sunfish (Lt. H.J. Bartlett, DSC, RN). They were escorted initially by the Free French submarine chaser Chasseur 5. HMS Cutty Sark (Cdr.(retired) R.H. Mack, RN) later took over the escort for onwards passage northwards through the Irish Sea. (10)

14 Nov 1943
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay where she joined the 7th Submarine Flotilla for training duties. (10)

11 Dec 1943
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Rothesay for St. Johns, Newfoundland, Canada.

Zeehond was to proceed to Bermuda to aid in A/S training from that base.

For the daily positions of HrMs Zeehond during this (aborted) passage see the map below.

(11)

18 Dec 1943
Early in the morning HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) set course to return to the U.K. So far she had been making the passage in very bad weather which resulted in a very high fuel consumption. There was now not enough fuel on board to reach St. Johns. (11)

22 Dec 1943
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Londonderry, Northern Ireland. (11)

26 Dec 1943
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Londonderry for Rothesay. (9)

14 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Rothesay for Lerwick. She made the passage north through the Minches together with HMS Venturer (Lt. J.S. Launders, DSC, RN) that was to proceed to Scapa Flow. They were escorted by HMS Brimness (T/Skr. W. Anderson, RNR). (11)

17 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Lerwick. She departed for her 1st war patrol later the same day. She was ordered to perform an anti-uboat patrol in the Norwegian Sea. 1

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

(11)

25 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was ordered to return to Lerwick. (11)

26 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) ended her 1st war patrol at Lerwick. (11)

27 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Lerwick for Rothesay. Passage was made together with 3580 HMS Vampire (Lt. C.W. Taylor, RNR). They were escorted by HMS Annet (T/Lt. E.H. Andrews, RNVR) until the Pentland Firth when HMS Crowlin (A/Skr.Lt. A. Smith, RNR) took over the escort. Also HrMs O 19 (Lt.Cdr. A. van Karnebeek, RNN) joined for onward passage to Holy Loch. (11)

29 Feb 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 19 (Lt.Cdr. A. van Karnebeek, RNN) and HMS Vampire (Lt. C.W. Taylor, RNR) arrived at Stornoway. They departed again later the same day for Holy Loch. HMS Cutty Sark (A/Cdr. E.A. Stocker, DSC, RN) was now their escort. (11)

1 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay. (11)

8 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was docked at Rothesay. (12)

12 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked. (12)

16 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was ordered to proceed to Lerwick. She was to patrol off Norway as the British thought the German battleship Tirpitz was going to return to Germany for repairs. Safari made the passage North together with HMS Safari HMS Safari (Lt.Cdr.(Retd.) J.R.G. Harvey, RN) and HMS Una (Lt. C.A.J. Nicholl, RN). They were escorted by the Canadian corvette HMCS Camrose (T/A/Lt.Cdr. L.R. Pavillard, RCNR). (11)

18 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Lerwick. She departed for her 2nd war patrol later the same day. She was ordered to patrol off the Norwegian coast. 2

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

(11)

21 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was ordered to return to Lerwick. (11)

23 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) ended her 2nd war patrol at Lerwick. (11)

24 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Lerwick for Rothesay. She made the passage together with HMS Truant (Lt. E.C. Croswell, DSC, RN), HMS Safari (Lt.Cdr. (retired) J.R.G. Harvey, RN), HMS Vivid. (Lt. J.C. Varley, RN) and HMS Una (Lt. C.A.J. Nicholl, RN). They were escorted by the British minesweepers HMS La Capricieuse (Lt.Cdr.(retired) C.M. Norman, RN). (11)

27 Mar 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Rothesay from where she resumed her training duties. (11)

11 Sep 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was docked at Rothesay. (13)

18 Sep 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked. (13)

26 Oct 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was docked at Rothesay. (13)

28 Oct 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) was undocked. (13)

18 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Rothesay for Dundee. She made the passage together with HrMs O 15 (Lt. R.W. van Lynden, RNN). The submarines were escorted by HMS Castlenau (T/Skr. G. Wood, RNR). (13)

19 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) arrive at Tobermory. (14)

20 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) shifted from Tobemory to Loch Alsh. (14)

21 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) shifted from Loch Alsh to Stornoway. (14)

23 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) shifted from Stornoway to Loch Eriboll. (14)

24 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) departed Loch Eriboll to continue their passage to Dundee. (14)

25 Nov 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN), HrMs O 15 (Lt. R.W. van Lynden, RNN) and their escort HMS Castlenau (T/Skr. G. Wood, RNR) arrived at Dundee. (14)

29 Dec 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Dundee for Scapa Flow. She was escorted by HMS Ebor Abbey (T.Skr. G.H. Harwood, RNR). (14)

30 Dec 1944
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Scapa Flow where she was to participate in A/S exercises. (14)

1 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Virago (Lt.Cdr. A.J.R. White, RN). (14)

3 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Mauritius (Capt. C.A.E. Stanfield, RN) and HMS Apollo (Capt. J.A. Grindle, CBE, RN). (14)

4 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises off Scapa Flow. (14)

5 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Virago (Lt.Cdr. A.J.R. White, RN). (14)

6 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Bellona (Capt. C.F.W. Norris, DSO, RN). The cruiser also conducted gunnery exercises. (15)

8 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises off Scapa Flow. (14)

9 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises off Scapa Flow. (14)

10 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises off Scapa Flow. (14)

11 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Cavalier (Lt.Cdr. D.T. McBarnet, RN). (14)

12 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted exercises off Scapa Flow. (14)

13 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Cavalier (Lt.Cdr. D.T. McBarnet, RN). (14)

15 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) conducted A/S exercises off Scapa Flow with HMS Opportune (Cdr. R.E.D. Ryder, VC, RN), HMS Cavendish (Cdr. R.H. Maurice, DSO, RN) and HMS Cavalier (Lt.Cdr. D.T. McBarnet, RN). (14)

16 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) departed Scapa Flow for Dundee. She was escorted by HNoMS Narvik. (14)

17 Jan 1945
HrMs Zeehond (Lt.Cdr. Baron D.T. Mackay, RNN) arrived at Dundee. (14)

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