Barbed wire in front of the Hindenburg Line, near Bellicourt, 4 October 1918. This photo was taken six days after the British broke through the Hindenburg Line, and the depth and density of the belts of barbed wire is clear. The senior artillery officer in the sector noted that the artillery had not done enough against the barbed wire to clear the way for an attack, and if it had not been for the much lower morale of the German infantry the British would not have won the battle.

Source: IWM photo Q9382.