With the army expanding for
World War I, Smith was promoted to
lieutenant colonel on July 24, 1917, and temporary
colonel on August 5. From February to August 1918, he commanded the
309th Cavalry Regiment, first at Camp Logan, then at Fort Sam Houston. From September 1920 to September 1921 he served in the office of the deputy chief of staff for Intelligence (G-2). He served in the Regulations Branch of the Personnel Division until July 1924. He was then posted to
Fort Thomas, Kentucky, where he served as chief of staff for Fifth Corps Area until November 1924. From November 1924 to September 1925, Smith was assigned to assist with organizing and training the
83rd Division, an Ohio-based unit of the
Organized Reserve Corps. From September 1925 to 1928, he was
Fifth Corps Area's liaison officer to the Organized Reserve Corps. In April 1928, Smith was posted to Panama, where he served as commander of the Panama Pacific General Depot. After returning to the United States, he was assigned as
Ninth Corps Area liaison officer to the Organized Reserve Corps. He remained in this post until retiring. ==Retirement and death==