The Naval Battle of Casablanca delayed off-loading cargo, and postponed departure from the Moroccan coast. On the evening of 12 November 1942, she was riding at anchor in Fedhala Roads when the "Kriegsmarine" submarine commanded by Ernst Kals slipped in among the ships and fired five torpedoes at three transports. All torpedoes hit their targets, and they burst into flames. The victims were transports , , and "Tasker H. Bliss". All were abandoned and the first two sank shortly, but "Tasker H. Bliss" burned until 02:30 the next morning and then sank. She was struck from the Naval Vessel Register on 7 December.