 Escorting slow convoy ONS 7  bound for Halifax, Canada, she sank the  off Cape Farewell, Greenland on the night of 17 May.The U-boat had earlier torpedoed the steamer "Aymeric", the last British cargo ship in the Atlantic to be sunk that month, claiming the lives of 53 men.Under the command of Lieutenant Commander John Jackson, DSC, RNR, "Swale" moved astern of the doomed "Aymeric" and made ASDIC (sonar) contact.