 Smith was later transferred to the headquarters, U.S. First Army under General John J. Pershing and became Secretary of the General Staff, VII Corps under Major generals Omar Bundy and William G. Haan.While in this capacity, he took part in the Meuse-Argonne Offensive and following the Armistice, Smith participated in the occupation of the Rhineland, while stationed at the corps headquarters in the town of Wittlich.He was later ordered to Montabaur and assumed duty as Aide-de-Camp to the commanding general, 1st Infantry Division, Edward F. McGlachlin.