The gun shields for the shelter-deck six-inch guns were replaced by armoured casemates in 1922. Two years later, her anti-aircraft defences were upgraded by replacing the original three-inch AA guns with a pair of QF AA guns. During the ship's 1928–1929 refit, two more four-inch AA guns were added and the six-inch guns from the shelter deck were removed. In addition a High-Angle Control System (HACS) Mk I director was installed on the spotting top. In 1931 one octuple mount for two-pounder Mk VIII "pom-pom" guns was added abreast the funnel (only on the starboard side) for trials. Its director was added abreast and below the fire-control director in the spotting top. The aft torpedo tubes were also removed at that time. The ship's 1936–1937 refit saw the removal of the torpedo director and its associated rangefinder. Two years later, "Revenge"s anti-aircraft defences were strengthened by replacing the single mounts of the AA guns with twin mounts and adding the portside octuple two-pounder "pom-pom" mount and its director. A HACS Mk III director replaced the Mk I on the roof of the spotting top and another was added in the position formerly occupied by the torpedo director. A pair of quadruple mounts for Vickers .50 machine guns were added abreast the conning tower. The forward torpedo tubes were also removed at that time.