42cm kurze Marinekanone 14 L/12 in Räderlafette (Short Naval Cannon 14 L/12), M-Gerät or 'Big Bertha'

The 42cm kurze Marinekanone 14 L/12 in Räderlafette (Short Naval Cannon 14 L/12), M-Gerät or 'Big Bertha' was a massive 420mm howitzer that played a major part in the German victories early in the First World War, but that slowly faded from significance as the war developed.