The American Expeditionary Forces (AEF) consisted of the United States Armed Forces (mostly the United States Army) that were sent to Europe in World War I to support the Allied cause (due to the Central Powers' hostility to the U.S.).
The American Expeditionary Forces (AEF) consisted of the United States Armed Forces (mostly the United States Army) that were sent to Europe in World War I. When it was sent to Europe, it had seven corps and two unassigned divisions. Its four million men were deployed to support the Allied cause (due to the Central Powers' hostility to the U.S.).