The "London"-class ships' main armament consisted of four breech-loading (BL) BL Mk IX guns mounted in two twin-gun turrets, one each fore and aft of the superstructure. Each gun was provided with 80 rounds. The guns had a maximum range of with their shells. Their secondary armament consisted of a dozen BL Mk VII guns on single mounts positioned in casemates amidships, six on each broadside. Eight of these were mounted on the main deck and the remainder on the upper deck; the main-deck guns were difficult to work in heavy weather. 200 rounds per gun were carried by the ship. They had a maximum range of approximately with their shells. Fourteen quick-firing (QF) 12-pounder 12-cwt guns were fitted for defence against torpedo boats. Four of these were on the main deck, one pair at each end of the ship and the remaining ten on the upper deck. "Prince of Wales" also carried four 3-pounder Hotchkiss guns, two in each fighting top and one on each turret roof. The ship was fitted with four submerged 18-inch (450 mm) torpedo tubes, two on each broadside abreast the barbettes.