douamont

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First picture: Top view of Fort Douamont at the very begining of the german offensive at Verdun, 1916.
Second picture: The same fort right after the german bombardment. 
P.S.: Note the trenches all the way around the fort at the second picture.

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Fort Douamont before and after the Battle of Verdun, 1916. During the first phases of the operation, german forces captured the fort without resistance from the french, it’s estimated that the french took over 100,000 casualties to retake this position.