At 21.31 hours on 22 June 1943, U-593 fired a spread of four torpedoes at convoy Elastic about eight miles northeast of Cape Corbelin and hit USS LST-333 and USS LST-387 with one torpedo each. The first was beached and declared a total loss, while the latter was towed to Dellys and later repaired. The torpedoeing of these two ships hampered the training for the forthcoming invasion of Sicily (Operation Husky).

USS LST-333 (Lt P.O. Krahen Buhl, USN) was struck by the torpedo on the starboard side in the stern. The explosion demolished the stern section, carried away the screws and rudder and stopped the engines. About 20 minutes after the hit, the landing craft USS LCT-244 and USS LCT-19 took the landing ship in tow and proceeded slowly towards the beach. After one hour, the submarine chaser USS SC-503 came alongside and took off 32 injured crew members and 24 injured passengers and brought them to Algiers. After five hours of towing, the stern of the landing craft came aground near Dellys. The crew and passengers were taken off by the landing craft and brought to Dellys. The USS LST-333 later sank during a salvage attempt on 6 July.