He started operations by sinking the Belgian Ville de Mons on the 2nd of the month, N.E. of Rockall. Proceeding westward he sank the British Titan on the 4th when N.W. of Rockall, and it is thought that he then fell in with convoy S.C.2, … sinking on the 7th the Norwegian Gro and two British ships, the Jose de Larrinaga and the Neptunian. Following the convoy south-eastwards towards Ireland until after dark on the 8th, he sank two more British vessels, the Poseidon and the Mardinian, about 100 miles N.W. of Malin Head.
Approaching the harbour Patch saw an Italian submarine on the surface. This was an unexpected bonus. It was later learnt that this was the submarine Iride, exercising with frogmen who were planning to make a covert attack on the British base at Alexandria. Patch released his torpedo from 30 feet at a distance of 300 yards and scored a direct hit below the conning tower.