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On This Day - April 20

1917H32Laid Down
1940Swordfish (N61)HMS Swordfish fires 6 torpedoes against the German merchant Santos about 17 nautical miles south-south-east of Larvik, Norway. All torpedoes fired missed their target.
1940Seal (N37)HMS Seal arrived at Blyth.
1940Utmost (N19)Launched
1942Trident (N52)HMS Trident torpedoes and sinks the German merchant Hadur in the Svefjord, Norway.
1945Tradewind (P329)HMS Tradewind sinks a Japanese tug and two Japanese sailing vessels with gunfire in the Gulf of Siam.

LossesSubmarine Badges