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Noteable events involving Seahorse include:

3 Aug 1943
USS Seahorse (Cmdr Donald McGregor) left Pearl Harbor for her first war patrol, and was to patrol off the Palau Islands.

6 Sep 1943
USS Seahorse (Cmdr Donald McGregor) is damaged by depth charges while on her first war patrol off the Palau Islands in position 07º31'N, 134º21'E. She was attacking a convoy, but despite being damaged she remains on patrol. (see map)

27 Sep 1943
USS Seahorse (Cdr. D. McGregor) ends her first, unsuccesful, war patrol at Midway.

20 Oct 1943
After a refit USS Seahorse (Lt Cmdr Slade Deville Cutter) left base for her 2nd war patrol, and was to patrol off Honshu in Japanese home waters.

2 Nov 1943
While operating south of Honshu USS Seahorse (Lt.Cdr. S.D. Cutter) had a very succesful day. She torpedoed and sank the Japanese troop transport Chihaya Maru (7089 GRT) in position 29º31'N, 134º50'E, the transport ship Yawata Maru (1852 GRT) in position 28º30'N, 135º35'E and finally the transport ship Ume Maru (5859 GRT) in position 28º40'N, 135º35'E. (see map)

22 Nov 1943
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoed and sank the Japanese transport ship Daishu Maru (3322 GRT) in the East China Sea in position 33º41'N, 128º35'E. (see map)

27 Nov 1943
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoed and sinks the Japanese tanker San Ramon Maru (7309 GRT) in the East China Sea in position 33º36'N, 128º57'E. (see map)

12 Dec 1943
USS Seahorse (Lt.Cdr. S.D. Cutter) ended a succesful 2nd war patrol at Pearl Harbor.

6 Jan 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) left Pearl Harbor for her 3th war patrol. She was to patrol off the Palau Islands.

16 Jan 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoed and sank the Japanese merchant Nikko Maru (784 GRT) south-east of the Mariana Islands in position 12º49'N, 150º19'E. (see map)

21 Jan 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese troop transport Ikoma Maru (3156 GRT) and transport ship Yasukuni Maru (3021 GRT) about 280 nautical miles east-south-east of Palau in positon 03º19'N, 137º02'E. (see map)

30 Jan 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese transport ship Toko Maru (2747 GRT) south-east of Palau in position 06º10'N, 138º14'E. (see map)

1 Feb 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese troop transport Toei Maru (4004 GRT) about 175 nautical miles south of Woleai in position 04º24'N, 143º15'E. (see map)

16 Feb 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) ended her very succesful 3th war patrol when she returned to base at Pearl Harbor.

16 Mar 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) left Pearl Harbor for her 4th war patrol. She was to patrol in the Mariana Islands area.

8 Apr 1944
USS Seahorse (Lt Cmdr Slade Deville Cutter) torpedoes the Japanese munitions transport Aratama Maru (6783 GRT) and damages the water carrier Kizugawa Maru (1915 GRT) off Guam in position 13º16'N, 145º11'E. The explosion on Aratama Maru damaged the Japanese destroyer Asakaze (offsite link). The burning Aratama Maru is beached but explodes and sinks the next day. The damaged Kizugawa Maru is towed to port by the Japanese destroyer Minazuki (offsite link). (see map)

9 Apr 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese troop transport Misaku Maru (4667 GRT) about 40 nautical miles west of Saipan in position 15º32'N, 145º00'E. (see map)

20 Apr 1944
There is a claim that USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese submarine RO-45 (offsite link) off the Mariana Islands in position 15º19'N, 145º31'E. But according to the combinedfleet.com website this is not the case as RO-45 was active after this date. (see map)

27 Apr 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese troop transport Akikawa Maru (5244 GRT) about 150 nautical miles west of Saipan in position 14º46'N, 143º22'E. (see map)

11 May 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) ends her 4th war patrol at Brisbane, Australia.

11 Jun 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) leaves Brisbane, Australia for her 5th war patrol. She is ordered to patrol in the Luzon Strait between Formosa and Luzon.

27 Jun 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese tanker Medan Maru (5135 GRT) south-south-west of Formosa in position 21º10'N, 120º31'E. (see map)

3 Jul 1944
During the night of 3 / 4 July 1944 USS Seahorse (Lt.Cdr. S.D. Cutter) torpedoes and sinks the Japanese merchants Gyoyu Maru (2232 GRT), Niito Maru (2186 GRT) and Kyodo Maru No.28 (1518 GRT) in the South China Sea about 140 nautical miles south of Hong Kong in position 20º18'N, 115º02'E. (see map)

19 Jul 1944
USS Seahorse (Lt.Cdr. S.D. Cutter) ends her 5th war patrol at Pearl Harbor.

6 Oct 1944
While on her 6th war patrol USS Seahorse (Lt Cmdr Charles Warren Wilkins) torpedoes and sinks the Japanese Coast Defense Vessel Kaibokan 21 (745 tons, offsite link) about 140 nautical miles north-west of Cape Bojeador, Luzon in position 19º27'N, 118º08'E. (see map)

18 Oct 1944
USS Seahorse (Lt.Cdr. C.W. Wilkins) ends her 6th war patrol at Midway. She is ordered to the Mare Island Navy Yard for overhaul.

9 Mar 1945
USS Seahorse (Cmdr Harry Holt Greer,Jr.) left base for her 7th war patrol, and was ordered to patrol the Tsushima Strait.

9 Apr 1945
USS Seahorse (Cdr. H.H. Greer, Jr) sinks a small junk with gunfire in position 33º20'N, 127º36'E. (see map)

18 Apr 1945
USS Seahorse (Cdr. H.H. Greer, Jr) is damaged by depth charges in Tsushima Strait in position 33º45'N, 128º26'E and is forced to terminate her patrol.

12 Jul 1945
After repairs and overhaul USS Seahorse (Cdr. H.H. Greer, Jr) left Pearl Harbor for her 8th war patrol. She was to patrol of the Izu Islands, Japan. When the war ended on 15 August 1945 Seahorce was on patrol 40 miles southeast of Hachijo Shima. She returned to Midway in the later half of August.