28 Jun, 1942
With her trials and training completed USS Guardfish (Lt.Cdr. T.B. Klakring) departs New London bound for Pearl Harbour via the Panama Canal.

25 Jul, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) arrives at Pearl Harbour.

6 Aug, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) departs Pearl Harbour for her 1st war patrol. She is ordered to patrol in Japanese home waters off northeast Honshu.

22 Aug, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) sinks a Japanese fishing vessel with gunfire east of Honshu in position 39º40'N, 142º10'E. (see map)

24 Aug, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese passenger-cargo ship Seikai Maru (3109 GRT) off the entrance to Sendai harbor, on the northeast coast of Honshu, Japan in position 38º12'N, 141º30'E. (see map)

2 Sep, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese merchant Teikyu Maru (2332 GRT) (former Danish Gustav Diederickson) about 17 nautical miles south-east of Muroran, Hokkaido, Japan in position 42º08'N, 141º15'E. (see map)

4 Sep, 1942
While operating off Kuji Bay, Iwate Prefecture, Japan, USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese merchants Kaimei Maru (5253 GRT) and Chita Maru (2276 GRT) in position 40º14'N, 141º51'E, and the Japanese passenger cargo ship Tenyu Maru (3728 GRT) in position 40º12'N, 141º49'E. (see map)

15 Sep, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) ended a very succesful first war patrol at Midway.

30 Sep, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) departs Midway for her 2nd war patrol. She was ordered to patrol in the East China Sea.

21 Oct, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese merchant Nichiho Maru (6362 GRT) about 120 nautical miles north-north-east of Formosa in position 27º03'N, 122º42'E. (see map)

28 Nov, 1942
USS Guardfish (Lt.Cdr. T.B. Klakring) ended her 2nd war patrol at Pearl Harbour.

2 Jan, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) departs Pearl Harbour for her 3rd war patrol. She is ordered to patrol off Truk.

12 Jan, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese Patrol Boat No.1 (1390 tons, former destroyer Shimakaze, offsite link) about 10 nautical miles south-west of the Tingwon Islands, Bismarck Archipelago in position 02º51'S, 149º43'E. (see map)

23 Jan, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) torpedoes and sinks the Japanese destroyer Hakaze (offsite link) south of Steffen Strait, between New Ireland and New Hanover, Bismarck Archipelago in position 02º47'S, 156º38'E. (see map)

15 Feb, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) ends her 3th war patrol at Brisbane, Australia.

9 Mar, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) departs Brisbane for her 4th war patrol. She is ordered to patrol in the Bismarck Archipelago and Solomon Islands area.

30 Apr, 1943
USS Guardfish (Lt.Cdr. T.B. Klakring) ended her 4th war patrol at Brisbane.

2 May, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) departs Brisbane for her 5th war patrol. Once again she was ordered to patrol the Bismarck Archipelago and Solomon Islands area.

13 Jun, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese transport ship Suzuya Maru (897 GRT) off the southwest coast of New Ireland in position 03º08'S, 151º24'E. (see map)

14 Jul, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) picked up a surveying party on the west coast of Bougainville.

2 Aug, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) ends her 5th war patrol at Brisbane.

24 Aug, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) departs Brisbane for her 6th war patrol. Once again she was ordered the Bismarck Archipelago and Solomon Islands area.

8 Oct, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese transport ship Kashu Maru (5460 GRT) north of Manus in position 00º20'S, 146º17'E. (see map)

3 Nov, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) ended her 6th war patrol at Brisbane.

27 Dec, 1943
USS Guardfish (Lt.Cdr. N.G. Ward) departs Brisbane for her 7th war patrol. She is ordered to patrol off Truk.

14 Jan, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese fleet tanker Kenyo Maru (10024 GRT, offsite link) some 520 nautical miles east-south-east of Palau in position 05º23'N, 141º32'E. (see map)

1 Feb, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese destroyer Umikaze (offsite link) off the southern entrance to Truk Atoll in position 07º11'N, 151º44'E. (see map)

18 Feb, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) ended her 7th war patrol at Pearl Harbour. She was now sent to San Francisco for an overhaul.

16 Jun, 1944
With her overhaul completed USS Guardfish (Lt.Cdr. N.G. Ward) departs Pearl Harbour for her 8th war patrol. She is ordered to patrol off Formosa together with USS Thresher and USS Piranha.

16 Jul, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese transport ships Mantai Maru (5862 GRT) and Jinzan Maru (5215 GRT) off Cape Bojeador, Luzon, Philippines in position 19º21'N, 119º43'E. (see map)

17 Jul, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese merchant Hiyama Maru (2838 GRT) west of Luzon, Philippines in position 18º21'N, 119º49'E. (see map)

19 Jul, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) torpedoes and sinks the Japanese transport ship Teiryu Maru (6512 GRT) in the South China Sea, south-west of Formosa in position 20º00'N, 118º29'E. (see map)

31 Jul, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) ended her 8th war patrol at Midway.

23 Aug, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) departs Midway for her 9th war patrol. She is ordered to patrol in the Sea of Japan together with USS Thresher and USS Sunfish.

2 Sep, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) sinks the Japanese merchant Shirakami Maru (873 GRT) with gunfire north of Chichi Jima in position 29º48'N, 140º20'E. (see map)

24 Oct, 1944
USS Guardfish (Lt.Cdr. N.G. Ward) ends her 9th war patrol at Guam.

26 Nov, 1944
USS Guardfish (Lt.Cdr. D.T. Hammond) departs Guam for her 10th war patrol. She was ordered to patrol in the South China Sea.

24 Jan, 1945
While on the return trip to Guam from an unsuccesful 10th war patrol, USS Guardfish (Lt.Cdr. D.T. Hammond) mistakenly sinks the US salvage vessel USS Extractor in Philippine Sea in position 15º44'N, 133º29'E. The Extractor sinks taking 6 members of her crew with her. The remainder of the crew is picked up by Guardfish and taken to Guam where they arrived on 26 January 1945. (see map)

27 Feb, 1945
USS Guardfish (Lt.Cdr. D.T. Hammond) departs Saipan for her 11th war patrol. She was ordered to patrol off Kii Suido.

11 Apr, 1945
USS Guardfish (Lt.Cdr. D.T. Hammond) ends her 11th war patrol at Midway.

8 May, 1945
USS Guardfish (Lt.Cdr. D.T. Hammond) departs Midway for her 12th war patrol. She was ordered to perform lifeguard duty off the coast of Honshu.

16 Jun, 1945
USS Guardfish (Lt.Cdr. D.T. Hammond) sinks a Japanese fishing vessel with gunfire east of Honshu in position 38º23'N, 145º00'E. (see map)

26 Jun, 1945
USS Guardfish (Lt.Cdr. D.T. Hammond) ends her 12th war patrol at Pearl Harbour. She was now assigned to training duties.