Why didn’t the Allies march on Berlin in 1918?

With the First World War in its fifth year, the Allies had the Germans at their mercy. So why, asks David Stevenson, did they accept an armistice rather than go in for the kill?

The Saint-Quentin canal, part of the Germans’ Hindenburg Line, which the Allies broke through on Sunday 29 September 1918. (Photo by 2nd Lt. D McLellan/ IWM via Getty Images)

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