 U @-@ 38 sank six ships . First sent to the bottom was the neutral Irish steam trawler ST Leukos on 9 March , with a single shell at point @-@ blank range off Tory Island , all 11 crew were lost . The Leukos was fishing in the company of British trawlers ; it has been speculated that she positioned herself between the surfacing U @-@ boat and the fleeing British in the belief that her neutral markings would protect her . This event was followed by the sinking of the Danish motor freighters SS Argentina on 17 March and SS <unk> and SS Christiansborg on 21 March . The Norwegian motor freighter MV <unk> was sunk on 26 March . The sixth and final ship sunk during this third patrol was the Finnish steam freighter SS Signe on 2 April . After nearly six weeks on the high seas , U @-@ 38 returned to Wilhelmshaven on 5 April 1940 . 
