PzKpfw VIII Maus (Mouse) - super-heavy tank completed in late It is the heaviest fully enclosed armoured fighting vehicle ever built. Only two hulls and one turret were completed before the testing grounds were captured by the advancing Soviet forces.
The was designed for the United States Army during World War II as a counter to the German heavy tanks. It was also set to be used for attacking the heavy defences expected of the German Siegfried Line.
Tortoise The Tortoise is a British tier 9 tank destroyer.The development of this assault tank began in The design was finalized by February and an order was placed for 25 vehicles. However, by the fall of 1947 only five tanks had been manufactured.