Allied Warships

Sennet (SS-408)

Submarine of the Balao class

USS Sennet shortly after the Second World War.

Navy	The US Navy
Type	Submarine
Class	Balao
Pennant	408
Built by	Portsmouth Navy Yard (Kittery, Maine, U.S.A.)
Ordered	8 Jun 1942
Laid down	8 Mar 1944
Launched	6 Jun 1944
Commissioned	22 Aug 1944
End service	15 Jun 1973
History	Decommissioned and stricken 15 June 1973. Sold 15 June 1973 to be broken up for scrap. More info available at this website (offsite link).

Commands listed for USS Sennet (408)

Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.

	Commander	From	To
1	T/Cdr. George Egbert Porter, Jr., USN	22 Aug 1944	30 May 1945
2	Lt.Cdr. Charles Robert Clark, Jr., USN	30 May 1945	Apr 1946 (1)

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Notable events involving Sennet include:

6 Oct 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) arrived at Newport, Rhode Island from Portsmouth, New Hampshire for her torpedo trials.

11 Oct 1944
With her torpedo trials completed, USS Sennet (Cdr. G.E. Porter, Jr., USN), arrived at New London, Connecticut from Newport, Rhode Island.

23 Oct 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) departed New London, Connecticut for Solomons, Maryland to conduct special test for the Naval Mine Warefare Test Station.

24 Oct 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) arrived at Solomons, Maryland from New London, Connecticut to conduct special test for the Naval Mine Warefare Test Station.

11 Nov 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) departed Solomons, Maryland for the Panama Canal Zone.

19 Nov 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) arrived in the Panama Canal Zone from Solomons, Maryland.

29 Nov 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) departed the Panama Canal Zone for Pearl Harbour.

16 Dec 1944
USS Sennet (Cdr. G.E. Porter, Jr., USN) arrived at Pearl Harbor.

5 Jan 1945
USS Sennet (Cdr. G.E. Porter) departed from Pearl Harbor for her 1st war patrol. She was ordered to patrol north of the Bonin Islands.

23 Jan 1945
USS Sennet (Cdr. G.E. Porter) sank the Japanese guard boat Kainan Maru No.7 (84 GRT) with gunfire off the Bonin Islands most likely in position 30°00'N, 140°16'E.

The position is often reported as 30°00'N, 120°16'E but this can't be correct. This position is well inside Hangchow Bay, China. This was not even near Sennet's patrol area and besides that i dont expect any US submarine to patrol that in deep inside Hangchow Bay.

31 Jan 1945
USS Sennet (Cdr. G.E. Porter) ended her 1st war patrol at Saipan.

7 Feb 1945
USS Sennet (Cdr. G.E. Porter) departed from Saipan for her 2nd war patrol. She was ordered to patrol off southern Honshu, Japan.

13 Feb 1945
USS Sennet (Cdr. G.E. Porter) is damaged by gunfire from a Japanese guard boat, either Kotoshiro Maru No.8 or Showa Maru No.3, south of Japan. Nevertheless Sennet sank the Kotoshiro Maru No.8 (109 GRT) with gunfire in position 30°00'N, 136°30'E.

16 Feb 1945
USS Sennet (Cdr. G.E. Porter) torpedoed and sank the Japanese minelayer Naryu (720 tons, offsite link) southeast of Honshu, Japan in position 32°10'N, 135°54'E. Sennet herself is damaged by depth charges from a Japanese aircraft.

8 Mar 1945
USS Sennet (Cdr. G.E. Porter) ended her 2nd war patrol at Guam.

3 Apr 1945
USS Sennet (Cdr. G.E. Porter) departed from Guam for her 3rd war patrol. Once again she was ordered to patrol off Honshu.

19 Apr 1945
While operating off the Kii Suido off the south coast of Kyushu, Japan, USS Sennet (Cdr. G.E. Porter) torpedoed and sank the Japanese auxiliary submarine chaser Cha 97 (130 tons) in position 33°32'N, 135°23'E and the Japanese merchant cargo ship Hagane Maru (1901 GRT) in position 33°35'N, 135°23'E.

28 Apr 1945
USS Sennet (Cdr. G.E. Porter) torpedoed and sank the Japanese cable layer Hatsushima (1564 GRT) off the Kii Suido, south-south-east of Mikizaki, Japan in position 33°55'N, 136°18'E.

1 May 1945
USS Sennet (Cdr. G.E. Porter) torpedoed and damaged the Japanese corvette Kaibokan 50 (740 tons, offsite link) off Wakayama, Japan in position 33°58'N, 136°17'E.

16 May 1945
USS Sennet (Cdr. G.E. Porter) ended her 3rd war patrol at Pearl Harbor.

1 Jul 1945
USS Sennet (Lt.Cdr. Charles Robert Clark, Jr.) departed from Pearl Harbor for her 4th war patrol, and was ordered to patrol in the Sea of Japan.

13 Jul 1945
USS Sennet (Lt.Cdr. C.R. Clark, Jr.) arrived at Guam.

16 Jul 1945
USS Sennet (Lt.Cdr. C.R. Clark, Jr.) departed from Guam.

28 Jul 1945
While operating in the Sea of Japan off the west coast of Honshu USS Sennet (Lt.Cdr. C.R. Clark, Jr.) torpedoed and sank the Japanese merchant cargo ships Hagikawa Maru (2995 GRT) about 8 nautical miles west of Noshiro harbour in position 40°17'N, 139°50'E, and Unkai Maru No.15 (1205 GRT) and Hakuei Maru (2863 GRT) off Sakata in position 39°49'N, 139°47'E.

30 Jul 1945
USS Sennet (Lt.Cdr. C.R. Clark, Jr.) torpedoed and sank the Japanese merchant cargo ship Yuzan Maru (6039 GRT) near Mutsuta Mizaki, western Hokkaido, Japan in position 42°36'N, 139°49'E.

9 Aug 1945
USS Sennet (Lt.Cdr. C.R. Clark, Jr.) ended her 4th war patrol at Saipan.