The primary anti-ship armament was two to four Mark 8 torpedoes, which weighed and contained a TNT warhead. These torpedoes were launched by Mark 18 steel torpedo tubes. Mark 8 torpedoes had a range of at . These torpedoes and tubes were replaced in mid-1943 by four lightweight Mark 13 torpedoes, which weighed and contained a Torpex-filled warhead. These torpedoes were carried on lightweight Mark 1 roll-off style torpedo launching racks. The Mk13 torpedo had a range of and a speed of .