Comparing: Challenger vs. AT 7

Created in 1942 based on the extended chassis of the Cromwell. One definite advantage of the new vehicle was its 17-pounder gun, which was the most powerful British gun at that time. This allowed the tank destroyer to effectively hit the enemy at distances up to 1,000 meters. However, the vehicle had a large silhouette and the chassis was overloaded. A total of about 200 vehicles were built.

Conceived as an assault breakthrough tank, this design was completed by June 10th, 1943. No complete prototypes were built. However, some parts and components of the AT7 were used in the A39 Tortoise.