Operation Creek (also known as Operation Longshanks) was a covert military operation undertaken by the Special Operations Executive in World War II on 9 March 1943. It involved a nighttime attack by members of the Calcutta Light Horse and the Calcutta Scottish against a Nazi German merchant ship, the Ehrenfels, which had been transmitting information to U-boats from Mormugao Harbour in neutral Portugal's territory of Goa. The attack was successfully carried out, and the Ehrenfels and three other Axis merchant ships were sunk, stopping the transmissions to the U-boats.