What was the Hundred Days' Offensive?

The Hundred Days' Offensive was a series of decisive Allied victories on the Western Front that effectively ended World War I.1

Beginning with the Battle of Amiens on August 8, 1918, the campaign saw Allied forces—bolstered by significant reinforcements from the United States—break through German lines and force the German army into a continuous retreat. This offensive marked a shift in momentum, as the Allies utilized superior numbers, tanks, and improved tactical coordination to overcome the stalemate of trench warfare that had characterized much of the conflict.12

The success of these operations led to the collapse of the German military position and contributed to internal unrest in Germany, ultimately compelling the German government to seek peace. The campaign concluded with the signing of the armistice on November 11, 1918, bringing the war to an end.12