800MM SCHWERER GUSTAV RAILWAY GUN vs DEFENSE - Men of War Assault

80cm/800mm Schwerer (Heavy or Great) Gustav railway gun is the biggest gun ever used in combat, that happend in 1942. This is a true wonder weapon because of

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Which modern gun can outmatch the WW2 800mm Schwerer Gustav? - Quora

World War II in Pictures: Big Guns of World War II