During World War II, the Russians did not waste any time in the manufacture of super-heavy artillery; they had an effective ground attack aircraft, the Sturmovik, which was directly under army control just as the Stuka dive-bomber was in the German Army, and this acted as the heavy artillery. The heaviest gun put into the field was the 203mm B-4 howitzer and one suspects that had it not already existed, it would not have been built during the war. There were a number of versions of this weapon, but the most common was this model on the tracked carriage. When inspected closely, it can be seen that this carriage has been derived directly from an agricultural tractor design, and was ideal for floating such a heavy gun across the snow and mud of the Russian winter and spring. Sold Out!