USS Plymouth (PG-57)
|Builder:||Friedrich Krupp Germaniawerft|
|Acquired:||4 November 1941|
|Commissioned:||29 December 1941|
|Fate:||Sunk by U-566, 5 August 1943|
|Displacement:||1,500 long tons (1,524 t)|
|Length:||264 ft 5 in (80.59 m)|
|Beam:||46 ft 2 in (14.07 m)|
|Draft:||19 ft (5.8 m)|
|Speed:||15 knots (28 km/h; 17 mph)|
|Complement:||155 officers and men|
USS Plymouth (PG-57), a patrol gunboat, was the fourth ship of the United States Navy to be named for Plymouth, Massachusetts, a town founded by the Pilgrims in 1620 on Plymouth Bay, about 35 miles southeast of Boston.
Plymouth's keel was laid down in 1931 by the Friedrich Krupp Germaniawerft in Kiel, Germany, as Alva. She was originally built as a yacht for William Kissam Vanderbilt II and was named after his mother, Alva Vanderbilt Belmont.
Inshore Patrol Squadron, 1942–1943
She departed Jacksonville on 31 December for the Navy Yard, Washington, DC, arriving there on 4 January 1942. She sailed on 21 January and the next day entered the Norfolk Navy Yard. On 23 January, she was placed in commission in ordinary for conversion to a patrol gunboat. She was placed in full commission 20 April and assigned to Inshore Patrol Squadron, 5th Naval District, based at Norfolk, Virginia. On 8 May she departed Norfolk, forming part of the escort for a convoy en route to Key West, Florida. She was on continuous escort duty between New York, Norfolk, and Key West until 27 August 1942, when she steamed from New York as convoy escort for Guantanamo Bay, Cuba, returning as escort for another convoy 12 September. She made two more convoy escort voyages to Guantanamo Bay and back to New York between 17 September and 24 October 1942. She then resumed escort duty between New York and Key West. During one period of this duty, 24 December 1942 to 13 June 1943, Plymouth completed eight convoy escort voyages from New York to Key West and back.
Sinking, 5 August 1943
On her last voyage, Plymouth departed New York City on 4 August 1943 as part of the escort for a convoy bound for Key West. At 21.37 hours the following evening she made underwater sound contact about 90 miles east of Elizabeth City, North Carolina. As she swung left, to bear on the target, a violent underwater explosion occurred just abaft the bridge. The force of the explosion rolled Plymouth to starboard. She then took on a heavy list to port with her entire port side forward of amidships in flames. She sank within two minutes.
Lieutenant Ormsby M. Mitchel, Jr., USNR, in command of Plymouth, was thrown violently against a bulkhead and sustained serious injuries, which later required amputation of his left leg. Despite his own condition, he directed abandon ship operations, remaining at his post until the ship went down. Rescued from a raft by Calypso, Lieutenant Mitchel was awarded the Navy Cross for extraordinary heroism. Soundman 3/Class Franklin A. McGinty was also awarded the Navy Cross and Purple Heart posthumously. Ensign Rubin Keltch, of New York City, was also awarded the Navy Cross posthumously for his service aboard the Plymouth. Ensign Keltch unhesitatingly risked his life to assist several survivors to safety. After making sure they were safe he went back in to the engine room to save several men, but although the men came out he never did.
Rescue operations were hampered by heavy seas and sharks. Only 85 of the crew survived to be taken to Norfolk on 6 August. A Board of Investigation concluded that Plymouth had been sunk by a torpedo fired from an enemy submarine. The submarine was U-566.
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