The top of the armoured citadel of the "Nelson"-class ships was protected by an armoured deck that rested on the top of the belt armour. Its non-cemented armour plates ranged in thickness from over the main-gun magazines to over the propulsion machinery spaces and the secondary magazines. Aft of the citadel was an armoured deck thick at the level of the lower edge of the belt armour that extended almost to the end of the stern to cover the steering gear. The conning tower's KC armour was thick with a roof. The secondary-gun turrets were protected by of non-cemented armour.