Attached to the 1st Submarine Flotilla, based in Alexandria and under the command of Lieutenant-Commander Edward Christian Frederick Nicolay DSO RN (see Nicolay (family)), she sank the 3,867-ton Italian tanker Maya 5 nautical miles south of Tenedos on 5 September 1941, and the following month, on 2 October, the 2,086-ton merchant ship Castellon west of Benghazi.