The accidents of military geography also began to work to the Germans’ disadvantage. The nearer they… — John Keegan

The accidents of military geography also began to work to the Germans’ disadvantage. The nearer they approached Amiens, the more deeply did they become entangled in the obstacles of the old Somme battlefield, a wilderness of abandoned trenches, broken roads and shell-crater fields left behind by the movement of the front a your earlier. The Somme may not have won the war for the British in 1916 but the obstacle zone it left helped to ensure that in 1918 they did not lose it.

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