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.