The "Sturmtiger" is a self-propelled assault gun based on the chassis of a Tiger heavy tank that was damaged in the battlefield. It has a combat weight of 65 tonnes, a crew of five, a length of 6.28 metres and a width of 3.57 metres. Its main feature was a short, thick mortar (mortar). This "Sturmtiger" type of vehicle is one of the few of its kind in the world."The design of the Sturmtiger originated in August 1943, when the German army was locked in an arduous street battle in Stalingrad. Although many large-calibre howitzers and other suppressive weapons were deployed, they were still not powerful enough. In this situation, Hitler ordered the development of the Grizzly infantry assault gun. However, its 150mm gun was still not powerful enough to meet the military's requirements. The Sturmtiger, a heavy assault gun vehicle, was developed on a Tiger tank chassis, and the German Army ordered the RW61 380mm heavy mortar, originally used by the Navy for anti-submarine purposes, to be mounted on a Tiger tank chassis to create the Tiger assault gun. The main gun was manufactured by Rheinmetall and the hull was modified by Arquette. From the outset, this plan gave the Assault Tiger a formidable destructive power.