On August 15 1918, Haig refused demands from Foch that he continue the Amiens offensive, even though the attack was faltering as the troops outran their supplies and artillery, and German reserves were being moved to the sector. Instead, Haig began to plan for an offensive at Albert, which opened on August 21. The main attack was launched by the British Third Army, with the United States II Corps attached.
The second battle began on August 21 with the opening of the Battle of Bapaume to the north of the river itself. That developed into an advance which pushed the German Second Army back over a 55 kilometre front, from south of Douai to La Fère, south of Saint-Quentin, Aisne. Albert was captured in August 22. On August 26, the British First Army widened the attack by another twelve kilometers. Bapaume fell on August 29. The Australian Corps crossed the Somme River on the night of August 31, and broke the German lines at Mont St Quentin and Péronne. The British Fourth Army's commander, General Henry Rawlinson, described the Australian advances of August 31-September 4 as the greatest military achievement of the war.[1] By September 2, the Germans had been forced back to the Hindenburg Line, from which they had launched their offensive in the spring
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