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Notable events involving Tudor include:

The history of HMS Tudor as compiled on this page is extracted from the patrol reports and logbooks of this submarine. Corrections and details regarding information from the enemy's side (for instance the composition of convoys attacked) is kindly provided by Mr. Platon Alexiades, a naval researcher from Canada.

This page was last updated in December 2018.

19 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

22 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

23 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

24 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

28 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

30 Dec 1943
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (1)

2 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Plymouth. (2)

7 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. (2)

10 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Plymouth. (2)

11 Jan 1944
HMS Tantalus (Lt.Cdr. H.S. Mackenzie, DSO and Bar, RN) departed from Portsmouth for Larne via Plymouth. She was escorted until off Plymouth by the Free French submarine chaser Chasseur 10 when HMS Tudor (Lt. S.A. Porter, DSC, RN) joined and HMS Rosevean (T/A/Lt.Cdr. L.H. Hill, DSC, RNVR) took over the escort. (3)

12 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed Plymouth for Holy Loch. She made the passage together with HMS Tantalus (Lt.Cdr. H.S. Mackenzie, DSO and Bar, RN). They were escorted by HMS Rosevean (T/A/Lt.Cdr. L.H. Hill, DSC, RNVR). (2)

14 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Holy Loch to begin a period of trials and training. (2)

15 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (2)

16 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted speed trials on the Arran measured mile. (2)

20 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (2)

21 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (2)

23 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) shifted from Holy Loch to Arrochar where she was to conduct her torpedo discharge trials. (2)

24 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted torpedo discharge trials off Arrochar. (2)

26 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted torpedo discharge trials off Arrochar. (2)

28 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted torpedo discharge trials off Arrochar. (2)

29 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted torpedo discharge trials off Arrochar. (2)

31 Jan 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted torpedo discharge trials off Arrochar. Upon completion of these trials she proceeded to Holy Loch. (2)

4 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted echo sounding and S.T.U. (mine detection0 trials in the Clyde area. (4)

5 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (4)

6 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (4)

7 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted noise trials in Loch Goil. (4)

11 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) and HMS Vivid (Lt. J.C. Varley, RN) both conducted attack exercises in the Clyde area during which they made practice attacks on each other. (4)

12 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) and HMS Vivid (Lt. J.C. Varley, RN) both conducted attack exercises in the Clyde area during which they made practice attacks on each other. (4)

13 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted RD/F exercises off Campbeltown. (4)

14 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises in the Clyde area. (4)

15 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted speed trials on the Arran measured mile. (4)

16 Feb 1944
HMS Terrapin (Lt.Cdr. D.S.R. Martin, DSO and 2 bars, RN) and HMS Tudor (Lt. S.A. Porter, DSC, RN) both conducted attack exercises in the Clyde area with HMS Jan van Gelder (Lt. P.D. O'Driscoll, RNR) serving as target. These exercises included night exercises. (5)

17 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) returned to Holy Loch on completion of her exercises. (4)

19 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed Holy Loch exercises and subsequent passage to Scapa Flow. She made the passage together with HMS Sea Nymph (Lt. J.P.H. Oakley, DSC, RN) and HrMs O 21 (Lt.Cdr. J.F. van Dulm, RNN). They were escorted by HMS Wallflower (Lt. G.R. Greaves, RNR). (4)

20 Feb 1944
HMS Sea Nymph (Lt. J.P.H. Oakley, DSC, RN) departed the Clyde for Lerwick. She made the passage North through the Minches together with HMS Tudor (Lt. S.A. Porter, DSC, RN) (to Scapa Flow) and HrMs O 21 (Lt.Cdr. J.F. van Dulm, RNN) (to Dundee). They were escorted by HMS Wallflower (Lt. G.R. Greaves, RNR). (6)

21 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Scapa Flow where she was to participate in A/S exercises. (4)

22 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Scapa Flow. (4)

23 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

24 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

25 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

26 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

28 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

29 Feb 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (4)

29 Feb 1944
HMS Diadem (Capt. E.G.A. Clifford, RN) conducted underway refuelling exercises at Scapa Flow. These were followed by A/S exercises with HMS Tudor (Lt. S.A. Porter, DSC, RN). (7)

1 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (8)

2 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (8)

3 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow.

The day started with A/S exercises with HMS Sheffield (Cdr. G.M. Sladen, DSO, DSC, RN). (9)

4 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (8)

6 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (8)

7 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) participated in A/S exercises off Scapa Flow. (8)

9 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted gunnery exercises off Scapa Flow. (8)

10 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed Scapa Flow for Holy Loch. She made the passage together with HMS Sea Nymph (Lt. J.P.H. Oakley, DSC, RN) which came from Lerwick. They were escorted by HMS Cutty Sark (Cdr.(Retd.) R.H. Mack, RN). (8)

11 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Holy Loch. (8)

13 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Holy Loch in AFD 7. (8)

14 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. (8)

15 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted attack exercises in the Clyde area. These included night exercises. (8)

16 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) proceeded to Larne upon completion of last night's exercises. (8)

17 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted A/S exercises off Larne with aircraft. (8)

18 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted A/S exercises off Larne with aircraft. (8)

20 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) and HMS Porpoise (Lt.Cdr. H.A.L. Marsham, OBE, RN) conducted attack exercises off Larne on each other. (10)

22 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Larne. (8)

23 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Larne. (8)

24 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Larne. (8)

25 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted A/S exercises off Larne with aircraft. (8)

26 Mar 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) shifted from Larne to Holy Loch. (8)

5 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials off Holy Loch. (11)

11 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted noise trials in Loch Goil. (11)

12 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted trials in the Clyde area. (11)

13 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted special noise trials in Loch Goil. (11)

14 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted special noise trials in Loch Goil. (11)

15 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted special noise trials in Loch Goil. (11)

16 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) shifted from Loch Goil to Holy Loch. (11)

19 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed Holy Loch to conduct special deep water noise trials off the Hebrides with HMS Loring (Lt. A.d'E.T. Sangster, RN). (11)

28 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) returned to Holy Loch on completion of her special deep water noise trials off the Hebrides with HMS Loring (Lt. A.d'E.T. Sangster, RN). (11)

29 Apr 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted special noise trials in Loch Goil. (11)

8 May 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Holy Loch in ADF 7. (12)

9 May 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. She then proceeded to Loch Goil for noise trials. Upon completion of these she retuned to Holy Loch. (12)

16 May 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Holy Loch bound for Gibraltar. She is to proceed to Trincomalee to join the Eastern Fleet. She made the passage to south through the Irish Sea together with HrMs Zwaardvisch (Lt.Cdr. H.A.W. Goossens, RNN) and HMS Tudor (Lt. S.A. Porter, DSC, RN). They were escorted by HMS La Capricieuse (Lt.Cdr.(Retd.) C.M. Norman, RN).

For the daily positions of HMS Tudor during this passage see the map below.

(12)

29 May 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Gibraltar. (12)

6 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN), HMS Thorough (Lt.Cdr. J.G. Hopkins, RN), HMS Statesman (Lt. R.G.P. Bulkeley, RN) and HMS Vigorous (Lt. J.C. Ogle, DSC, RN) all departed Gibraltar for Malta. They made the passage in convoy KMS 52. (13)

11 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Malta. (14)

19 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Malta bound for Port Said. (14)

24 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Port Said. (14)

26 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) transits the Suez Canal. (14)

27 Jun 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Suez bound for Aden. (14)

2 Jul 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Aden. (15)

6 Jul 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Aden bound for Trincomalee. (15)

16 Jul 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Trincomalee. (15)

31 Jul 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (15)

2 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (16)

3 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (16)

4 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (16)

4 Aug 1944
Around 0915FG/4, HMS Tally-Ho (Cdr. L.W.A. Bennington, DSO and Bar, DSC and Bar, RN) and HMS Tudor (Lt. S.A. Porter, DSC, RN) departed Trincomalee for exercises. They were escorted by HMIS Pansy (Lt. R.G. Main, RINR).

HMS Tally-Ho first conducted gunnery exercises on a target that was being towed by HMIS Pansy.

HMS Tudor first conducted noise trials and then joined the gunnery exercises.

Before returning to harbour around 1945FG/4, both submarines made a practice attack on HMS Indomitable (Capt. J.A.S. Eccles, RN, flying the flag of Rear-Admiral C. Moody, CB, RN) which was escorted by HMS Quilliam (Capt. R.G. Onslow, DSO and 2 Bars, RN), HMAS Quickmatch (Lt.Cdr. O.H. Becher, DSC, RAN) and HMS Redoubt (Lt.Cdr. N.E.G. Ropner, DSO, RN). (17)

6 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Trincomalee for her 1st war patrol. She is to patrol off the Northern entrance to the Malacca Straits and to perform a special mission.

For the daily and attack positions of HMS Tudor during this patrol see the map below.

(18)

17 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) lands a party to make a beach reconnaissance at Bireuen on the North coast of Sumatra. The party is recovered after about 3 hours. (18)

18 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) again lands a party to make a beach reconnaissance at Bireuen on the North coast of Sumatra. The party is recovered after about 3,5 hours. (18)

22 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank a junk with gunfire north of Sumatra in position 05°19'N, 96°30'E.

(All times are zone -6,5)
1246 hours - Surfaced to sink a junk, that was 3/4 laden, about 120 feet long and estimated to be 100 tons.

1253 hours - Dived. (18)

23 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) again lands a party to make a beach reconnaissance at Bireuen on the North coast of Sumatra. The party is recovered early the next day after about almost 4 hours. (18)

30 Aug 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 1st war patrol at Trincomalee. (18)

12 Sep 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Trincomalee in AFD 26. (19)

15 Sep 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. (19)

18 Sep 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (19)

19 Sep 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Trincomalee for her 2nd war patrol. She is to patrol along the West coast of Siam and to lay a minefield.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

24 Sep 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) lays 10 mines off the west coast of Siam.

(All miles are zone -6,5)
2002 hours - Laid 6 mines staggered either side of a line 079° from position 07°23'3"N, 99°04'2"E up to the 5,5 fathom line. Distance between the mines was 600 feet. The depth of the water was 5,5 to 7 fathoms.

2050 hours - completed the first lay of 6 mines.

2310 hours - Commenced the second lay of 4 mines from position 07°28'N, 99°03'9"E, in a 275° direction staggered at 600 feet apart, in a depth of 7 fathoms.

2318 hours - Lay completed. (18)

14 Oct 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 2nd war patrol at Trincomalee. (18)

1 Nov 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (20)

2 Nov 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Trincomalee for her 3rd war patrol. She is to patrol along the West coast of Sumatra.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

16 Nov 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) destroys a Japanese coaster with gunfire of the west coast of Sumatra in position 02°18'S, 100°52'E.

(All times are zone -6,5)
0815 hours - Sighted a vessel rounding the buoy off Indrapura Point. Closed to the Northward.

0830 hours - Identified the target as a 150 ton motor ship with the engines and passenger accommodation aft. She was Southbound at 6 knots coast crawling keeping a steady one mile of the coast.

0925 hours - Surfaced in position 02°15'S, 100°48'E on the starboard quarter of the target, range 2000 yards and opened fire with the 4"gun and the Oerlikon. The vessel was soon hit aft in the engine room and stopped with a list to starboard. 3 other hits were observed in the hull after 12 rounds.

0929 hours - After the 12th round a Rufe floatplane was seen coming down the coast from the North. It was heard before it was seen, due to the low clouds.

0930 hours - Dived to 48 feet. Three bombs were dropped by the aircraft. The first one was rather close and did some damage to several gauges.

1130 hours - Sighted the target aground in position 02°18'S, 100°52'E. The stern was still in the water so Lt. Porter decided to fire a torpedo. Closed to the 10 fathom line.

1209 hours - Fired one torpedo from 2000 yards. After an in initial swerve 15° of course the torpedo exploded prematurely after running for 400 yards.

1345 hours - Sighted a patrolling aircraft so surfacing to finish of the ship with gunfire was now out of the question.

1500 hours - After the aircraft had left closed the target again.

1737 hours - Surfaced in position 02°18'5"S, 100°51'E. Opened fire from 2000 yards at the beached motor ship with the 4" gun and the Oerlikon. 8 hits out of 20 rounds of 4" were scored on the vessel. It was now well on fire. This is a total loss to the enemy.

1745 hours -Ceased fire and dived. Retired to the seaward. (18)

26 Nov 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 3rd war patrol at Trincomalee. (18)

11 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (21)

14 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (21)

15 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Trincomalee for her 4th war patrol. She is to patrol along the coast of Burma.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

22 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank a sailing vessel with gunfire of the west coast of Burma in position 13°42'N, 98°05'E.

(All times are zone -6,5)
1508 hours - Sighted a two mast schooner that was Northbound. Closed it while dived to attack it with gunfire. The vessel was tacking the coast and just before Tudor was about to surface it anchored off the coast and lowered it sails. She was of similar built to a Chinese timber tongkang.

1608 hours - Surfaced in position 13°42'N, 98°05'E and opened fire with the 4"gun, range 1300 yards. After hitting with the 3rd round paused to allow the crew to abandon ship, which they did not do. As Lt. Porter did not want to wait in this exposed position (shallow water) the shelling now continued until the vessel blew up with a very satisfactory explosion. The vessel was of about 70 tons and was probably carrying cased petrol judging by the flame and the smoke. 11 Rounds in all were fired for 5 hits.

1613 hours - Dived and retired from the scene. (18)

24 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank two sailing vessels with gunfire of the west coast of Burma in position 13°44'N, 98°04'E.

(All times are zone -6,5)
0800 hours - Sighted a 70 tons schooner rigged tongkang Northbound and a small two masted junk of 25 tons deep laden and also Northbound. Closed the schooner while dived for gun action.

0849 hours - Surfaced in position 13°43'N, 98°04'E and sank the schooner with 5 rounds of 4", all were hits. There was a pause in the shooting to allow the crew to abandon ship which they did not do. The shooting continued and the vessel soon exploded, she was most likely carrying ammunition.

Closed the junk which had now anchored of the shore. The crew was now on the beach having left their ship in a sampan. 18 rounds of 4" were fired before this ship also exploded in position 13°45'N, 98°04'E.

0901 hours - Dived. (18)

25 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank two sailing vessels with gunfire of the west coast of Burma. One in position 13°14'N, 98°17'E and one in position 13°19N, 98°22'E.

(All times are zone -6,5)
0845 hours - Closed a 15 ton two masted junk that was Northbound and deep laden.

0854 hours - Surfaced in position 13°14'N, 98°17'E and fired a warning shot. The crew did not abandon ship. Continued to fire with the 4" gun and after three rounds the vessel sank by the head.

0900 hours - Dived and set course to the Eastward.

1055 hours - A schooner was sighted to the East. It was Northbound. Closed the schooner while dived.

1208 hours - Surfaced in position 13°19'N, 98°22'E and fired a warning shot. The crew took no action. Continued the firing and after 11 hits after 13 rounds the vessel sank.

1214 hours - Dived and retired to the West. (18)

27 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank a sailing vessel with gunfire of the west coast of Burma in position 14°01'N, 98°02'E .

(All times are zone -6,5)
1100 hours - Sighted a two-masted schooner, deep laden and Northbound.

1131 hours - Surfaced in position 14°01'N, 98°02'E and sank the vessel with 14 rounds of 4".

1140 hours - Dived and proceed Southward. (18)

29 Dec 1944
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank a Japanese junk with gunfire of the west coast of Burma in position 13°47'N, 98°04'E.

(All times are zone -6,5)
1430 hours - Sighted a large junk Northbound. closed dived to a range of 1500 yards.

1609 hours - Surfaced in position 13°47'N, 98°04'E. The vessel was of 100 tons, had three masts and was flying the Japanese flag. Nine rounds were fired, all were hits. The vessel sank in 2,5 minutes.

1615 hours - Dived and proceeded southward. (18)

5 Jan 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 4th war patrol at Trincomalee. (18)

11 Jan 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Trincomalee in AFD 26. (22)

16 Jan 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. (22)

28 Jan 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted exercises off Trincomalee. (22)

30 Jan 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Trincomalee for Fremantle, Australia.

For the daily positions of HMS Tudor during this passage see the map below.

(22)

13 Feb 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Fremantle. (23)

1 Mar 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) conducted noise trials off Fremantle.

4 Mar 1945
During 4 and 5 March 1945, HMS Tudor (Lt. S.A. Porter, DSC, RN), conducted exercises off Fremantle, these included night exercises. (24)

7 Mar 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Fremantle for her 5th war patrol. She is to patrol in the Southern part of the South China Sea.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

22 Mar 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) attacks a convoy of two small merchants with three escorts in position 02°26'5"N, 108°54'E. Four torpedoes were fired at the largest merchant but none hit. Tudor was hunted and depth charged after the attack but managed to escape.

(All times are zone -8)
1234 hours - In position 02°27'N, 108°52'E sighted puffs of smoke to the South-East. Closed at speed.

1256 hours - The enemy's course appears to be about 050°, speed was about 5 knots. The vessels appeared to be heading towards Royalist Haven (Serasan Island).

1325 hours - Sighted masts and funnel of a ship. Range was about 6000 yards.

1327 hours - Sighted on modern escort ahead of the target using Asdic. The escort was about 400 tons with large sheer and concentrated superstructure, unlike any silhouette in the books, obviously it was new construction. The target was a 1400 ton merchant ship. Astern of the target was another escort with two raked masts and a low superstructure with a gun forward. Astern of this second escort was another merchant of about 1200 tons. Astern of this merchant was a trawler that was bringing up the rear.

1336 hours - In position 02°26'5"N, 108°54'E fired four torpedoes set at 6 feet. Went deep and turned South immediately after firing. No hits were obtained. The leading escort gained contact on Tudor. It went right overhead but dropped nothing at that time despite the firm contact. Shortly afterward 7 small depth charges were dropped but these were not too close. A further 8 depth charges were dropped but also none of these was too close. The escort then started an Asdic hunt. Tudor turned to the South-West to keep end on and gain deeper water.

1430 hours - The escort was joined by a second one. They were in contact but did not drop anything further. They just tried to keep Tudor down.

1500 hours - Heard no more of the escorts, HE and pinging had ceased.

1609 hours - After hearing nothing for over an hour returned to periscope depth. Tudor was detected right away as she came from under a density in the water. The escorts were obviously still there. Tudor returned to 110 feet and altered course to the Westward. The escorts passed overhead but did not drop anything.

1633 hours - Both escorts lost contact by now. No HE was heard.

1837 hours - Came to periscope depth and found nothing in sight.

1931 hours - Surfaced in position 02°20'N, 108°40'E. Set course for the channel south of Great Natuna Island hoping the enemy would go that way tomorrow. (18)

23 Mar 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) again sights the convoy she unsuccessfully attacked the day before. An attack is set up but as the American submarine USS Boarfish, that is also on the scene, is detected by one of the escorts the convoy changes course. Tudor's attack is spoiled by this change of course.

(All times are zone -8)
1440 hours - In position 03°27'N, 108°09'E sighted a vessel to the Southward. Commenced attack.

1447 hours - Identified the target as an American submarine that was going Northbound at 17 knots and was zigging. Ceased attack.

1454 hours - The American submarine was no longer in sight, it must have dived.

1520 hours - In position 03°26'5"N, 108°09'5"E sighted smoke to the South-East. Closed.

1541 hours - The smoke was identified as coming from a convoy. It was the same convoy that was attacked the day before. Commenced attack on the second merchant ship (Tudor was not in a correct position to be able to attack the first, slightly bigger, merchant ship).

1547 hours - Went deep and closed at speed.

1554 hours - The leading escort was pinging but not in contact.

1604 hours - The convoy zigged towards Tudor.

1605 hours - Tudor was now in position 03°26'N, 108°11'E when it was seen that the leading escort hoisted a flag, turned towards and increased speed. She was in contact but not with Tudor so it must have been the American submarine. The escort dropped 13 depth charges. Meanwhile the convoy had changed course spoiling Tudor's attack. The game of cat and mouse between the escort and both submarines continued for the rest of the day. (18)

15 Apr 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 5th war patrol at Fremantle. (18)

28 Apr 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is put on the slipway at Fremantle. (25)

30 Apr 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is put back in the water. (25)

3 May 1945
During 3/4 May 1945, HMS Tudor (Lt. S.A. Porter, DSC, RN), conducted exercises off Fremantle, these included night exercises. (26)

7 May 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Fremantle for her 6th war patrol. She is to patrol in the Eastern part of the Java Sea.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

10 Jun 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 6th war patrol (that was blank) at Fremantle. (18)

27 Jun 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is docked at Fremantle in USS ARD 10. (27)

28 Jun 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) is undocked. (27)

29 Jun 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Fremantle for her 7th war patrol. She is to patrol in the Java Sea. This is her last patrol before she is to be sent back to the U.K. for refit.

For the daily positions of HMS Tudor during this patrol see the map below.

(18)

9 Jul 1945
After repairs HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Fremantle to resume her 7th war patrol. (18)

23 Jul 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank a schooner with gunfire in the Java Sea in position 06°09'S, 108°13'E.

(All times are zone -9)
1445 hours - Sighted a schooner of about 150 tons Eastbound. The vessel was deep laden and there were oil drums on the upper deck. Closed submerged.

1530 hours - Surfaced in position 06°09'S, 108°13'E and fired warning shots. The crew eventually abandoned ship in a boat and the schooner was sunk with 4" gunfire.

1552 hours - Dived and resumed patrol going Northward. (18)

28 Jul 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) sank two Japanese sea trucks with gunfire in the Java Sea in position 06°48'S, 109°31'E.

(All times are zone -9)
1625 hours - Sighted two sea trucks of about 250 tons each. They were Westbound. No escort or air cover was visible. Closed the 10 fathom line submerged.

1637 hours - Surfaced in position 06°48'S, 109°31'E and opened fire on the leading sea truck. Scored hits on both and the both turned towards the beach and beached themselves. Both were abandoned by the crews. A total of 113 rounds of 4" were fired. Both vessels took many hits.

1707 hours - Turned to the seaward.

1719 hours - Dived in position 06°44'S, 19°34'E. (18)

29 Jul 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) destroys a Japanese sea truck with gunfire in the Java Sea in position 06°50'S, 109°37'E.

(All times are zone -9)
1845 hours - Sighted a sea truck on the beach at Pekalongan.

1905 hours - Surfaced in position 06°48'S, 109°42'E and opened fire from 4500 yards with the 4" gun. Now a laden sea truck was sighted 4 nautical miles to the West and Eastbound.

1906 hours - Ceased fire and set off to the laden sea truck of about 250 tons. The sea truck saw the submarine and headed towards the beach.

1919 hours - Opened fire from 4000 yards. The sea truck beached itself in position 06°50'S, 109°37'E. Fired 70 rounds for 30 hits. The vessel blew up with a spectacular explosion.

1942 hours - Set course to seaward. (18)

11 Aug 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) ended her 7th war patrol at Fremantle. (18)

22 Aug 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Fremantle bound for Aden. She is to proceed to the U.K. where she is to refit. (28)

11 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) makes a short call at Aden she departed from for Suez the same day. (29)

16 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Suez. (29)

17 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) transits the Suez Canal and arrived at Port Said. (29)

22 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Port Said bound for Gibraltar. (29)

28 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Gibraltar. (29)

30 Sep 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Gibraltar bound for Portsmouth. (29)

5 Oct 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) arrived at Portsmouth. (29)

23 Oct 1945
HMS Tudor (Lt. S.A. Porter, DSC, RN) departed from Portsmouth for the Devonport Dockyard where she is to refit. (29)

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