Schneider Obusiers de 520. This French 520mm howitzer was the biggest gun of the Great War. It could deliver a 3,100 lb shell (600 lbs of explosive) over 10 miles. The gun car was just under 100 feet long and weighed 290 tons.

Trenches on the Web - Photo Archive: Big Guns of the Great War

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Too bad they did not keep the thing operational for when the Germans came back in WWII.

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Work Harder ! Millions on welfare are depending on you.

wow what a massive weapon one would not want to be in a slit trench
with them raining down....

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for thow . will be ours someday.we shall have it all
... und mear.......