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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ArtStation - Railway Gun 800mm Gustav/Dora

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

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Future War Stories: FWS Topics: Artillery

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Schwerer Gustav: Largest Gun Mankind Has Ever Built