Schwerer Gustav or Dora the German 80 cm railway gun

Schwerer Gustav - Wikipedia

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TankHistoria - Schwerer Gustav was a German 80-centimetre (31.5 in) railway gun. It was developed in the late 1930s by Krupp in Rügenwalde as siege artillery for the explicit purpose of destroying

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Schwerer Gustav, the biggest gun to exist with its shell : r/interestingasfuck

The Heavy Gustav, Hitler and generals inspecting the largest caliber rifled weapon ever used in combat, 1941 - Rare Historical Photos