The American Expeditionary Forces (AEF) was the expeditionary force of the United States Army during World War I. It was established on July 5, 1917, in France under the command of Gen. John J. Pershing. During the United States campaigns in World War I it fought, alongside French and British troops, against the German Empire. Some of the troops fought alongside Italian forces in that same year, against the Austro - Hungarian Army. It helped the French Army on the Western Front during the Aisne Offensive (at Château - Thierry and Belleau Wood) in June 1918, and fought its major actions in the Saint - Mihiel and Meuse - Argonne Offensives in late 1918.
when did the first us troops arrive in france ww1
July 5, 1917