The necessity to protect the armoured units through the enemy aviation, pressed the English army to build up this self-propeller loaded with a Bofors 40 mm cannon, utilizing the hulls of the Crusader armoured tank, considered out-dated by the end of 1943. The cannon finished up being placed into a tower with armoured plating capable guarantee the required security towards gunners. The Crusader AA was distributed towards atmosphere detachments the protection associated with control units at the conclusion of 1943. Some detachments was in fact used through the entire French intrusion after the landing in Normandy, but as a result of the atmosphere superiority for the allies, the German environment threats proved inexistent, which means use of this self-propeller anti-aircraft was not many or null.