Sturmtiger

The Sturmtiger, also called the Sturmmörser, featured a distinct armament: a 38cm gun originally intended for use against enemy submarines. The gun fired rocket-propelled shells, the exhaust from which created so much pressure that a series of ventilation shafts had to be installed from the breech to the gun muzzle. Because the Tiger I chassis was the only chassis strong enough to mount such a gun, and because Tiger tanks were in high demand at the frontlines, only eighteen Sturmtiger vehicles were built, twelve of which were completed and sent into battle.