Villers-Bretonneux a British tank disabled one A7V and drove off two more. By the time of the arrival of the Sturmpanzerwagen, the Germans had already successfully developed their own brand of armor-piercing projectile as well. Near the end of the First World War it was clear that the A7V was a failure, being too slow and clumsy in action and slow to build. Therefore, it was decided that a lighter tank was required which could spearhead assaults and which could be mass-produced, and was called the Sturmpanzerwagen Oberschlesien. Thirteen companies bid for the contract and in the middle of 1918 construction of a design by Captain Müller was assigned to the Oberschlesien Eisenwerk of Gleiwitz, which had partially completed two prototypes by October 1918. It was a radical design for a fast-moving, lightly armored assault tank. The Oberschlesien included a track which was placed under the tank and only wrapped around half of it. The design sacrificed armor for the sake of speed and only required a 180 hp engine for the 19-ton body, giving it a projected ground speed of 14 km/h (8.7 mph). The tank featured such advanced features as a main cannon mounted on top of the tank in a central revolving turret, separate fighting and engine compartments, a rear-mounted engine and a low track run. Neither the ordered test models nor the improved "Oberschlesien II" already planned were finished before the end of the war. In the end, time running out on the new designs and the limitations of the A7V design, and being a part of the losing side of a war and fighting on the defensive, all led to a very average first try in the realm of tank design for the Germans. Interwar period The post-World War I Treaty of Versailles of 1919 prohibited the design, manufacture and deployment of tanks within the Reichswehr. The victors pushed for severe restrictions on the country's war-making capabilities and Germany took the brunt of the blame to the west and was forced into signing the Treaty in June 1919. Limitations for the land army included a 100,000-strong infantry army, absolutely no tanks of any kind and just a few armored vehicles for spot duty. The German Army became a shell of its former self. Paragraph Twenty-four of the treaty provided for a 100,000-mark fine and imprisonment of up to six months for anybody who "[manufactured] armoured