The Karl-Gerat Ausf. G is a German self-propelled siege mortar reminiscent of the massive guns used in the Weltkrieg, but motorised. It is the latest and most produced of the Karl-Gerat series, which had a rocky development, beginning in the interwar period. The Ausf. G is equipped with a higher velocity gun capable of 12km of range. It first appeared in 1945, designed to smash through Soviet heavy fortifications.