On completion, the ship's main armament consisted of four single QF 4 inch Mk V naval guns. This was supplemented by a quad-barrelled 2-pounder pom-pom, five .303-inch machine guns, and two triple 21-inch torpedo tube sets. Two chutes and four throwers for depth charges were installed later in the ship's career, with a payload of 50 charges carried. When "Vendetta" was converted into an escort vessel in 1942, her armament was changed to two 4-inch guns, two pom-poms, four 20 mm Oerlikon guns, seven .303-inch guns, and the depth charge equipment.