After stopping the Germans at the Second Battle of the Marne and pushing them back, the Allies unleashed the final offensive on the Western Front, the 100 Days.  Starting on August 8, 1918, British, French, and American divisions threw themselves at German lines, tearing wide breaches in long-held trench lines and capturing thousands of prisoners and hundreds of guns.

The first battle, Amiens, opened with 30,000 German casualties on its first day, compared to about 6,500 for the Allied forces.  German forces were pushed back and began to withdraw to the Hindenburg Line, giving up the gains they had made in the spring.

Other titanic battles met with similar success, causing the veritable collapse of German forces in France and Belgium.

Over the coming weeks, German lines slowly drew back, until the final climax of the Armistice on November 11.  By then, over a million men on the Allied side were killed, wounded, or missing, while the Germans lost almost 1.2 million, in the final onslaught on the Western Front.