| Noteable events involving Thrasher include: 17 Jun, 1941
HMS Thrasher (Lt.Cdr. P.J. Cowell, DSC, RN) heavily damages the French fishing vessel Virgo Fidelis (129 GRT) with gunfire in the Bay of Biscay off San Sebastian, Spain. The Virgo Fidelis is beached and declared a total loss.
15 Aug, 1941
HMS Thrasher (Lt.Cdr. P.J. Cowell, DSC, RN) fires four torpedoes against the German transport Ankara (4768 GRT) off Cape Sunion, Greece. All torpedoes however miss their target. 20 Aug, 1941
HMS Thrasher (Lt.Cdr. P.J. Cowell, DSC, RN) sinks the Greek sailing vessel San Stefano with gunfire off Cape Malea, Greece. 28 Oct, 1941
HMS Thrasher (Lt. H.S. Mackenzie, RN) sinks the Italian sailing vessel Esperia (384 BRT) with gunfire north-east of Benghazi, Libya. 25 Nov, 1941
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian merchant Attilio Deffenu (3510 GRT) about 20 nautical miles east of Brindisi, Puglia, Italy in position 40º37'N, 18º27'E. (see map) 10 Jan, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian merchant Fedora (5016 GRT) about 35 nautical miles north-east of Cape Dukato, Greece in position 38º59'N, 19º59'E. (see map) 16 Feb, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) makes a torpedo attack on the German merchant Arkadia (1756 GRT) off Suda Bay, Crete, Greece. All torpedoes fired however missed their target. 9 Apr, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian merchant Gala (1029 GRT) about 20 nautical miles west-south-west of Bengasi, Libya in position 31º49'N, 19º42'E. (see map) 13 Apr, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the German army cargo ship Atlas (2297 GRT) south-west of Bengasi, Libya in position 31º26'N, 18º56'E. She also sinks the Italian tug Pilo 210 (30 GRT) with gunfire in roughly the same area. (see map) 19 Apr, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) attacks the German barge F 184 with gunfire west of Derna, Libya in position 32º53'N, 22º23'E. Return fire forced Thrasher to break off the attack. (see map) 19 May, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian merchant Penelope (1160 GRT) about 5 nautical miles north-west of Monopoli, Italy in position 41º01'N, 17º16'E. (see map) 23 Jun, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian merchant Sant Antonio (1480 GRT, former Yugoslavian Anton, built 1919) in the Gulf of Sirte in position 31º53'N, 16º35'E.
At 2245 hours (time zone -3) on the 22nd Thrasher sighted the convoy (2 merchants, 1 torpedo boat) again she had already chased and attacked some hours before. At 0050 hours (23rd) she was in position six nautical miles right ahead of the convoy. She dived to make a submerged attack.
At 0133 hours three torpedoes were fired at the larger (2500 tons) of the two merchants. One hit was obtained. A slight and ineffective counter attack was carried out by the escorting torpedo boat. The merchant that was hit was heard to break up.
Note: the torpedo boat was the Italian Perseo. (see map) 29 Jun, 1942
HMS Thrasher (Lt. H.S. Mackenzie, RN) torpedoes and sinks the Italian sloop Diana (1568 tons) north of Tobruk, Libya in position 33º30'N, 23º30'E.
At 1125 hours (time zone -3) masts were sighted in position 33º21'N, 23º20'E, bearing 360º distance eight nautical miles away. The ship appeared to be coming steight towards. Five minutes later it could be seen that the vessel was a small auxiliary travelling at high speed. This ship must be carrying a very important cargo.
At 1144 hours six torpedoes were fired from 600 yards. No less then four hits were obtained and the ship sank quickly. There was an immediate counter attack by motor torpedo boats (these had not been seen previously). 17 depth charges were dropped. At 1240 hours Thrasher returned to periscope depth. At the place of the attack a few rafts were seen as well as two motor torpedo boats. (see map) 26 Jul, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) is bombed in error by a British Swordfish aircraft off Port Said, Egypt. She is under repair for about a month due to the damage sustained. 4 Sep, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) torpedoes and sinks the Italian merchant Padenna (1589 GRT) about 40 nautical miles north of Tobruk, Libya in position 32º44'N, 24º11'E. (see map) 12 Oct, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) sinks a Greek sailing vessel with gunfire in the Aegean Sea, about 15 nautical miles east of Cape Drepano, Sithonia peninsula, Greece in position 39º56'N, 24º17'E. (see map) 13 Oct, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) sinks a sailing vessel with gunfire in the Aegean Sea about 10 nautical miles south-west of Cape Pinnes, Athos peninsula, Greece in position 40º01'N, 24º10'E. (see map) 19 Oct, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) sinks the Italian tug Roma (130 GRT) with gunfire off Stampalia, Greece in position 36º43'N, 26º41'E. (see map) 20 Oct, 1942
HMS Thrasher (Lt. H.S. Mackenzie, DSO, RN) torpedoes and sinks the Italian merchant Lero (1980 GRT) between Symi and Rhodos Islands, Greece in position 36º26'N, 27º54'E. (see map) 22 Jan, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks four Japanese sailing vessels with gunfire of the west coast of Siam. 27 Jan, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks three Japanese sailing vessels with gunfire of the west coast of Siam. 28 Jan, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks three Japanese sailing vessels with gunfire of the west coast of Siam. 16 Mar, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks a Japanese sailing vessel with gunfire of the west coast of Burma. 18 Mar, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks a Japanese sailing vessel with gunfire of the west coast of Burma. 19 Mar, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks three Japanese sailing vessels with gunfire of the west coast of Siam. 22 Jun, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks three sailing vessels with gunfire off the west coast of Siam.
At 0650 hours (time zone -6.5) the sails of a junk were sighted south of Pulau Adang. It was a small vessel, only about 10 tons, and loaded with a cargo of rice. The crew was taken on board and the junk was sunk with gunfire.
At 0952 hours, a warning shot was fired against a junk of about 60 tons from 3000 yards. After the crew abandoned ship this junk was sunk with 14 rounds of gunfire.
At 1345 hours another junk was sighted. At 1440 hours the crew of six was seen to abandon ship. The junk, of about 30 tons, was then sunk with three rounds of gunfire. At 1459 hours HMS Thrasher made a crash dive as a Japanese 'Jake' aircraft dived down from the cloud cover. Thrasher bottomed at 40 feet. A small bomb exploded close by but did no damage. 25 Jul, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks a Japanese sailing vessel with gunfire north of the Strait of Malacca. 27 Jul, 1945
HMS Thrasher (Lt.Cdr. M.F.R. Ainslie, DSO, DSC, RN) sinks four Japanese coasters and a Japanese sailing vessel with gunfire in the northern part of the Strait of Malacca. | 
