The Hundred Days is explained as a sequence of attacks at different points along the German line. Repeated pressure limited the defenders' ability to move reinforcements from one threatened sector to another. Allied manpower and equipment made this possible, together with improved training, mapping, and artillery accuracy. Units suited to attacking could be rotated out and replaced by formations better suited to holding ground. The argument connects the campaign's mobility to capabilities developed through the preceding years of war.
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How repeated attacks sustained the Hundred Days offensive
Repeated attacks, trained troops, and improved artillery and mapping reduced German freedom to shift reserves along the front.