Hitler inspecting the massive 800mm Schwerer Gustav railway gun from afar. The Schwerer Gustav was a World-War-II German 80-cm (800-mm) field cannon, developed in the 1930’s. It was able to fire a 7-tonne high-explosive artillery shell at a huge target 37 kilometers away. The Gustav is 6 times heavier than the Krupp K5 and stands 4 stories tall, and in the spring of 1942 it becomes the biggest artillery piece ever used in combat. capable of obliterating a enemy fort with just 5-6 shells. In total is fires 300 rounds in the seige of siege of sevastopol. But all of it’s devastating power, the super gun has major drawbacks. One was it had to be traveled on special designed railway tracks, so you might need a couple of 1000 men to lay the railway. Another you needed several 100 people just to operate the gun. Also it rakes 3.5 days to assemble and only fire 14 rounds a day. And since the gun was huge it was very visible from the air, meaning the Gustav is easy prey for the bombers. Within a year the Germans are forced to stop using it.