First United States Army - Establishment and World War I

Establishment and World War I

First Army was established on 10 August 1918 as a field army when sufficient American military manpower had arrived in France during World War I. As an element of the American Expeditionary Force (AEF) in the latter stages of World War I it was the first of three field armies established under the AEF. Serving in its ranks were many figures who later played important roles in World War II. First Army was inactivated in April 1919.