Wartime modifications for the "Revenge"-class ships were fairly minimal. "Revenge" was fitted with a Type 279 early-warning radar in 1941. The following year saw the addition of a Type 273 surface-search radar, a pair of Type 285 anti-aircraft gunnery sets and two Type 282 radars for the "pom-poms". Two four-barrel "pom-poms" were added in late 1941 atop 'B' and 'X' turrets as well as ten 20 mm Oerlikon guns that replaced the quadruple .50-caliber mounts. To save weight and make more room available for the additional crew required to man the new equipment like the radars and Oerlikons, four 6-inch guns were removed in 1943.