16 Apr, 1943
With her trials and initial training completed USS Tinosa (Lt.Cdr. L.R. Daspit) arrives at Pearl Harbour.

3 May, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) departs Pearl Harbour for her 1st war patrol. She is ordered to patrol east of Kyushu, Japan.

10 Jun, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and damages the Japanese fleet oiler Iro (14050 GRT, offsite link) about 30 nautical miles off Fuka Island, Kyushu, Japan in position 31º14'N, 132º44'E. Tinosa is damaged in by depth charges during enemy counterattacks but she is able to remain on patrol. (see map)

19 Jun, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) ends her 1st war patrol at Midway.

9 Jul, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) departs Midway for her 2nd war patrol. She is ordered to patrol in the Caroline Islands area.

15 Jul, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and damages the Japanese armed merchant cruiser Aikoku Maru (10437 GRT) north of Truk in position 10º16'N, 151º27'E. (see map)

24 Jul, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and damages the Japanese oiler Tonan Maru No.3 (19210 GRT) west of Truk in position 06º56'N, 147º52'E.

Tinosa fired no fewer than 15 torpedos, of which 10 hit but only two exploded ! 8 were duds....the ship was heavily damaged but limped into Truk. It illustrated the unreliability of the American torpedoes, and efforts were redoubled to fix the faulty exploder mechanism after the Tinosa captain filed his report on the incident. He could see the Japanese crew running around the decks pointing at the torpeodes before they hit, but a loud thud was the only result time after time. (see map)

4 Aug, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) ends her 2nd war patrol at Pearl Harbour.

23 Sep, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) departs Pearl Harbour for her 3rd war patrol. Once again she is ordered to patrol in the Caroline Islands area.

25 Sep, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) toppes off with fuel at Johnston Island.

6 Oct, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and sinks the Japanese fleet tanker Kazahaya (18300 GRT) north-west of Truk in position 10º30'N, 148º20'E. The Kazahaya was torpedoed and damaged earlier that day by Tinosa's sister ship USS Steelhead. (see map)

16 Oct, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) ends her 3rd war patrol at Midway.

27 Oct, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) departs Midway for her 4th war patrol. She is ordered to patrol in the Palau / Truk shipping lanes.

22 Nov, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and sinks the Japanese army cargo ships Kiso Maru (4070 GRT) and Yamato Maru (4379 GRT) off Palau in position 07º09'N, 134º32'E.

Tinosa is damaged by depth charges in position 07º09'N, 134º34'E but is able to continue her patrol. (see map)

26 Nov, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and sinks the Japanese sinks Japanese army cargo ship Shini Maru (3811 GRT) and torpedoes and damages the Japanese army cargo ship Taiyu Maru (1873 GRT) south of Babelthuap in position 07º08'N, 134º48'E. (see map)

3 Dec, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) torpedoes and sinks the Japanese fleet tanker Azuma Maru (6646 GRT) north-west of Sonserol in position 06°34'N, 131°35'E. (see map)

16 Dec, 1943
USS Tinosa (Lt.Cdr. L.R. Daspit) ends her 4th war patrol at Fremantle, Australia.

10 Jan, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) departs Fremantle for her 5th war patrol. She is ordered to patrol in the South China Sea.

13 Jan, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) toppes off with fuel at Exmouth Gulf.

20 Jan, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) lands men and equipment in northeast Borneo.

22 Jan, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks the Japanese merchant tankers Seinan Maru (5401 GRT) and Koshin Maru (5485 GRT) about 120 nautical miles north of Labuan, Borneo in position 07º22'N, 115º05'E. (see map)

15 Feb, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks the Japanese army cargo ship Odatsuki Maru (1988 GRT) east of Dinagat Island in position 09º30'N, 127º00'E. (see map)

16 Feb, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks the Japanese army cargo ship Chojo Maru (2610 GRT) about 65 nautical miles south-east Siargao Island, Philippines in position 09º15'N, 127º05'E. (see map)

4 Mar, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) ends her 5th war patrol at Pearl Harbour.

29 Mar, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) departs Pearl Harbour for her 6th war patrol. She is ordered to patrol in the South China Sea south of Formosa.

2 Apr, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) toppes off with fuel at Midway.

3 May, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks Japanese merchant cargo ship Toyohi Maru (6436 GRT) west of the Bashi Channel between Formosa and Luzon in position 20º51'N, 118º02'E. (see map)

4 May, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks Japanese merchant cargo ship Taibu Maru (6440 GRT) west of the Bashi Channel between Formosa and Luzon in position 20º55'N, 118º12'E. (see map)

9 May, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) sinks a Japanese trawler with gunfire north of the Mariana Islands in position 22º20'N, 146º40'E. (see map)

15 May, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) ends her 6th war patrol at Majuro

7 Jun, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) departs Majuro for her 7th war patrol. She is ordered to patrol in the East China Sea.

18 Jun, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) damages a large Japanese sampam with gunfire in the East China Sea west of Kyusyu, Japan in position 33º45'N, 128º03'E. As the Japanese vessel refuses to sink Tinosa closes the target and sets it on fire finally sinking it. (see map)

3 Jul, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) torpedoes and sinks the Japanese merchant passenger/cargo ship Kamo Maru (7954 GRT) and the Japanese tanker Konzan Maru (2733 GRT) in the East China sea west of Kyushu, Japan in position 32º25'N, 128º46'E. (see map)

10 Jul, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) sinks the Japanese fishing vessel Shosei Maru No.5 (19 GRT) in the East China Sea about 30 nautical miles west of Danjo Island in position 32º12'N, 127º00'E. (see map)

30 Jul, 1944
USS Tinosa (Lt.Cdr. D.F. Weiss) ends her 7th war patrol at Pearl Harbour. She is now sent to the Hunters Point Navy Yard for a major overhaul.

7 Aug, 1944
USS Tinosa arrives at the Hunters Point Navy Yard.

23 Oct, 1944
With her overhaul completed USS Tinosa (Lt.Cdr. R.C. Latham) departs the Hunters Point Navy Yard for San Diego.

18 Nov, 1944
USS Tinosa (Lt.Cdr. R.C. Latham) arrives at Pearl Harbour.

4 Dec, 1944
USS Tinosa (Lt.Cdr. R.C. Latham) departs Pearl Harbour for her 8th war patrol. She is ordered to patrol of the Ryukyu Islands.

9 Dec, 1944
USS Tinosa (Lt.Cdr. R.C. Latham) toppes off with fuel at Midway.

30 Jan, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) ends her 8th war patrol at Pearl Harbour.

1 Mar, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) departs Pearl Harbour bound for Saipan.

17 Mar, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) departs Saipan for her 9th war patrol. She is ordered to patrol in the East China Sea.

7 Apr, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) ends her 9th war patrol at Guam.

28 Apr, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) departs Guam for her 10th war patrol. She is ordered to patrol in the Caroline Islands area.

16 May, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) ends her 10th war patrol at Guam.

29 May, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) departs Guam for her 11th war patrol. She is ordered to patrol in the Sea of Japan.

9 Jun, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) torpedoes and sinks the Japanese merchant cargo ship Wakatama Maru (2211 GRT) off the east coast of Korea in position 37º32'N, 129º10'E. (see map)

12 Jun, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) sinks the Japanese merchant cargo ship Keito Maru (873 GRT) with gunfire off Bokuko Ko, Korea in position 37º30'N, 129º20'E. (see map)

19 Jun, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) torpedoes and sinks the Japanese army cargo ship Wakae Maru (2000 GRT) off the east coast of Korea in position 38º25'N, 128º34'E. (see map)

20 Jun, 1945
While on patrol off the east coast of Korea USS Tinosa (Lt.Cdr. R.C. Latham) torpedoes and sinks the Japanese army cargo ship Taito Maru (2726 GRT) in position 36º04'N, 130º26'E and the Japanese merchant cargo ship Kaisei Maru (880 GRT) in position 35º39'N, 130º29'E. (see map)

4 Jul, 1945
USS Tinosa (Lt.Cdr. R.C. Latham) ends her 11th war patrol at Pearl Harbour.

11 Aug, 1945
After refitting, Tinosa set course for her 12th patrol. Before she reached her assigned area, this patrol was terminated by Japan's capitulation.

26 Aug, 1945
Tinosa departed Midway for an overhaul at San Francisco.