SM U-61 was a German Type U 57 U-boat commissioned and deployed to operate off the coast of the British Isles and attack coastal shipping as part of the U-boat Campaign during World War I.
In a 15-month career spanning nine war patrols, U-61 plagued allied shipping in the Atlantic Ocean during the German war on Allied trade (Handelskrieg). She sank 33 Allied ships, totalling . She also damaged six merchant ships of , two auxiliary warships of and one warship of 1,020 tons (the US Navy destroyer before fleeing the fight). She went missing some time after March 23, 1918.
Summary of raiding history
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World War I submarines of Germany
Type U 57 submarines
Ships built in Bremen (state) 1916 ships U-boats commissioned in 1916 Maritime incidents in 1918 U-boats sunk in 1918 U-boats sunk by unknown causes World War I shipwrecks in the Atlantic Ocean