The necessity to protect the armoured units through the enemy aviation, pressed the English military to develop this self-propeller designed with a Bofors 40 mm cannon, utilizing the hulls of this Crusader armoured tank, considered out-dated at the conclusion of 1943. The cannon had been put in a tower with armoured plating capable guarantee the required protection on gunners. The Crusader AA ended up being distributed towards the air detachments the security of the control units at the end of 1943. Some detachments had been used throughout the French invasion following the landing in Normandy, but as a result of the atmosphere superiority for the allies, the German atmosphere threats proved inexistent, which means usage of this self-propeller anti-aircraft had been not a lot of or even null.
