On 13 July 1943, the boat departed Algiers to patrol in the Gulf of Genoa and east of Corsica. Four days later, "Sickle" fired three torpedoes at an Italian convoy without success. On 18 July, she sank with gunfire two Italian minesweepers, "No. G.61" and "No. R.164", east of Gorgona, Italy. The next day, she sank another Italian minesweeper, "V 131", off Porto-Vecchio, Corsica. "Sickle" next attacked the Italian merchant ship "Alfredo Oriani" with seven torpedoes; two hit, but the ship did not sink and was towed back to port. The submarine also missed the German oil tanker "Champagne" on 22 July, then returned to Algiers on 28 July. Drummond was awarded the Distinguished Service Order at the end of this patrol.