Tunic M1917 wool Infantry 3rd Army with helmet (Tuniek US M1917 winter infanterie 3e Army)

The Third United States Army was first activated as a formation during the First World War on 7 November 1918, at Chaumont, France, when the General Headquarters of the American Expeditionary Forces issued General Order 198 organizing the Third Army and announcing its headquarters staff. On the 15th, Major General Joseph T. Dickman assumed command and issued Third Army General Order No. 1. The third Army consisted of three corps (III, Maj. Gen. John L. Hines; IV, Maj. Gen. Charles Muir; and VII, Maj. Gen. William G. Hahn) and seven divisions.