Nazi Germany’s DORA Gun
Built to destroy the French Maginot Line fortifications, this monstrous 800 mm railroad gun was completed too late to be used in the campaign against France (in which the Maginot Line was bypassed anyway). It was finally used at Sebastopol where it fired 48 7-ton shells over 13 days, demolishing Soviet forts with great thoroughness.
Hat tip to Ellie.
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