 On 28 May, about 150 miles south of the Mona Passage, she sank the unescorted American 6,759-ton Type C1 ship "Alcoa Pilgrim", carrying a cargo of bauxite ore,
and on 3 June, about 150 miles north-west of Trinidad, she torpedoed the unescorted American 6,940-ton tanker "M.F.Elliott".Hit below the waterline, the ship sank within six minutes.