In his later career, Smith served as an officer during the Spanish–American War and the subsequent Philippine Insurrection under Generals Leonard Wood and John J. Pershing. In 1910, he was appointed by Pershing as commander of the Philippine Constabulary and served at Fort Huachuca as commanding officer of Troop G, 5th U.S. Cavalry from 1912 to 1914. It was in this capacity that he accepted the surrender of Colonel Emilio Kosterlitzky, commander of Mexican federal forces at Sonora, on March 13, 1913. In 1918, he was appointed commander of Huachuca and the 10th U.S. Cavalry. Prior to his retirement, he also oversaw the construction of Camp Owen Beirne, adjacent to Fort Bliss, which served as the model for similar camps built following the end of World War I.