Final answer:
General John J. Pershing had the AEF ready for battle in May 1918, when US troops helped stem the German advance in battles in France.
Step-by-step explanation:
General John J. Pershing had the American Expeditionary Force (AEF) ready for battle in May 1918, when 70,000 newly arrived US troops helped stem the German advance in the battles of Cantigny. The US troops also contributed to the battles of Chateau-Thierry and Belleau Wood the following month. By July, the United States had twenty-five divisions in France, and the Allied Powers seized the initiative.