Production of Centurion Mk 3 was slower than production of 20-pounder guns, while the larger-gunned Conqueror tank was still under development to take on the primary anti-tank role. A mixed force of Centurion, Comet and Cromwell tanks was retained in service, but the Cromwell's armament lacked the punch to deal with more modern potential foes. With an increased requirement for anti-tank performance in the interim, an up-gunning of Cromwell was needed. This was to incorporate the same 20 pounder (84 mm) gun as used in the Centurion Mk 3.