 Complete the following phrase:  The tight limitations of the Washington Naval Treaty raised many challenges and required difficult compromises if they were to be met. To avoid the class being outgunned by the new ships of foreign navies, especially as by the mid-1930s the Treaty had been renounced by Japan and Italy, Churchill wrote to the First Lord of the Admiralty in 1936, voicing strong objections to the proposed armament of 10 14-inch guns. His proposal was for nine 16-inch guns. However, when completed King George V mounted ten guns. They were mounted in one Mark II twin turret forward and two Mark III quadruple turrets, one forward and one aft. They could be elevated 40 degrees and depressed 3 degrees. Training arcs were: A turret, 286 degrees; B turret, 270 degrees and Y turret, 270 degrees. Training and elevating was achieved through a hydraulic drive, with rates of two and eight degrees per second, respectively. A full gun broadside weighed 15,950 pounds; a salvo could be fired every 30 seconds. The quadruple turrets weighed 1,582 tons, the twin turret 915 tons. The turrets were designed by the Vickers Armstrongs Elswick Works, but sets of each type of equipment were manufactured by Vickers Armstrongs in Barrow. A considerable amount of design effort was expended to make the turrets as flashtight as possible. This complicated the mechanical design of the turrets, particularly the quadruple mountings. Due to insufficient clearances and slightly distorted link mechanisms, failures in the intricate safety interlocks in the loading sequence for antiflash precautions caused jams during drills and practice firing. During the summer of 1941 the King George V-class battleships had their main armament turrets and turret linkages modified to correct the operational faults revealed during 