Smith's early postings alternated between garrison service in field artillery and teaching at West Point as instructor of the separate subjects of chemistry, mathematics, ordnance, and gunnery. Made captain of the new Coast Artillery Corps in 1901, he was a student of the school of submarine defense and commanded Fort Monroe in 1908. In December 1901, Smith married Mary Prince Davis, the daughter of Brigadier General George B. Davis.[3] They were the parents of two children who died young and two who lived to adulthood, Katherine Alexander Smith and Colonel William R. Smith Jr.[3] In the years preceding World War I, Smith commanded anti-submarine technology schools and departments, in early 1917 stretching "the first submarine net put down in America, 2000 yards long, 84 feet at deepest point, extending from Fort Monroe to Fort Wool and closing entrance to Hampton Roads"[2]
Smith was given command of the 36th Division and promoted to major general of the National Army in the summer of 1918. After arriving in Brest, France, the 36th Division, Smith established a combat course for training at Bar-sur-Aube.[1] In October, Smith led the 36th Division while with the 2nd Division it was attached to the French Fourth Army under Henri Gouraud on its push to the Aisne River.[4] Smith remained in command of the division's demobilization in June 1919, seven months after the Armistice with Germany, when his National Army rank dissolved, his rank reverted again to colonel, U.S. Army.[1] For his service during the war he was awarded the Army Distinguished Service Medal, the citation for which reads:
The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Brigadier General William Ruthven Smith, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I. As Commanding General, 36th Division, by his thorough and ceaseless efforts, coupled with a keen insight into the principles of military training, General Smith brought his division to such a high standard of discipline and proficiency as to achieve conspicuous results in a major operation without previous service under fire. The excellent conduct of his division subsequent to the signing of the armistice reflects great credit on him. His services have been of great value to the American Expeditionary Forces.[5]
After promotion again to brigadier general, this time of the regular army, Smith served in several garrison commands in the Philippines, Fort Sam Houston, Fort Monroe again, and Honolulu, Hawaii, then returned to the United States Military Academy, this time to occupy the superintendent's billet, which he did from 1928 until 1932.[1] During his tour as superintendent, Smith helped secure Stewart Field in nearby Newburgh, New York as a base for the Army Air Corps and USMA pilot training.[6] Also during this period, his aide-de-camp was Floyd Lavinius Parks, who became a lieutenant general after World War II.
Civilian career
After retirement, Smith returned to his native state of Tennessee, settling in Sewanee where he became superintendent of the local military academy (now St. Andrew's-Sewanee School) and served in that capacity until his death.[1]