In the spring of 1918 the German army launched a series of devastating offensives against the French and British lines on the Western Front. For four months they threw literally everything they had at the Allies, sending them reeling all the way back to the Marne. But despite the most appalling losses, the British did not break, and when the German advance ran out of steam in the summer, the Allies finally turned the tables on them and began the astonishing...