American Expeditionary Forces

American Expeditionary Forces
G. H. Q. Distinctive Cloth Insignia
Active1917–1920
DisbandedAugust 31, 1920
CountryUnited States
BranchUnited States Army
RoleCommand and control
Size2,057,675 men (1918)
General HeadquartersChaumont, France
Nickname(s)AEF
EngagementsWorld War I
Commanders
Commander in ChiefGeneral of the Armies John J. Pershing
Commander of the Services of SupplyMajor General James Harbord
Chief of the Army Air ServiceMajor General Mason M. Patrick

The American Expeditionary Forces (AEF)[a] was a formation of the United States Armed Forces on the Western Front during World War I, composed mostly of units from the U.S. Army. The AEF was established on July 5, 1917, in France under the command of then-Major General John J. Pershing. It fought alongside French Army, British Army, Canadian Army, British Indian Army, New Zealand Army and Australian Army units against the Imperial German Army. A small number of AEF troops also fought alongside Italian Army units in 1918 against the Austro-Hungarian Army. The AEF helped the French Army on the Western Front during the Aisne Offensive (at the Battle of Château-Thierry and Battle of Belleau Wood) in the summer of 1918, and fought its major actions in the Battle of Saint-Mihiel and the Meuse-Argonne Offensive in the latter part of 1918.

  1. ^ Yockelson, p. 241.


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