btm - tortoise

The Tank, Heavy Assault, Tortoise (A39) was a British heavy assault tank design developed in World War II but never put into mass production. It was developed for the task of clearing heavily fortified areas and as a result favoured armour protection over mobility.
Although heavy, at 78 tons, and not readily transportable, it was considered reliable and a good gun platform.
Only a few prototypes of the Tortoise had been produced by the end of the war.