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American Expeditionary Force

On 25 June the first US troops began to arrive in France, forming the American Expeditionary Force. However, the American units did not enter the trenches in divisional strength until October. The incoming troops required training and equipment before they could join in the effort, and for several months American units were relegated to support efforts. Despite this, however, their presence provided a much-needed boost to Allied morale, with the promise of further reinforcements that could tip the manpower balance towards the Allies.