Comparing: KV-2 vs. O-I

Heavy assault tank. Developed on the basis of the KV-1 in January 1940, with a total of 334 vehicles manufactured from 1940 through 1941. The KV-2 tanks were used in action in 1941, with most of the vehicles lost the same year.

Development of the superheavy tank was started after the Battles of Khalkhyn Gol in 1939. The vehicle was designed as a maneuverable fire unit that was unprecedented in scale—its hull alone weighted 100 tons. Only one prototype was built, without a turret and made of construction steel. Trials were discontinued due to the unreliable engine; at the end of 1944, the prototype was scrapped. The 15-cm howitzer was to be mounted on the tank after the assemble.