In the American Civil War Elkins' father and brother joined the Confederate Army under Sterling Price, but he joined the Union Army. Before he joined the Union Army he was to encounter Quantrill's Raiders twice and was spared from being killed because of his father and brother. He noted: Elkins entered the Union Army as a captain of militia in the 77th Missouri Infantry. He served under Kersey Coates and only saw action once in the Battle of Lone Jack, which he said filled him with disgust for war. Elkins noted that his good fortune of being protected by Quantrill matched a fear of being butchered by Quantrill for becoming a Union soldier as Quantrill's Raiders were thought to be present at the battle. Elkins and Foster from the Lone Jack Battle were to argue for a pardon for Younger following his conviction in the Northfield, Minnesota bank robbery.
New Mexico
Elkins entered the practice of law at Mesilla, New Mexico, and was elected to the territorial legislature in 1864 and 1865. He was appointed territorial district attorney for a term from 1866 to 1867. It was at this time, on June 10, 1866, that he married his first wife Sarah Simms Jacobs. In 1867, Elkins served as attorney general of the territory and later as U.S. district attorney from 1867 to 1870. He was elected territorial delegate to the U.S. Congress in 1872, and reelected in 1874, serving from March 4, 1873 to March 4, 1877. In 1875, he met and married his second wife, Hallie Davis, and continued to practice law. He founded and was president of the Santa Fe National Bank, and pursued broad business interests in land, rail, mining, and finance including president of the massive Maxwell Land Grant Company. In attempting to evict "squattors" from the Land Grant he would be accused of being part of the Santa Fe Ring. Along with his brother in law, Thomas B. Catron, Elkins participated in what would become the largest land speculation conspiracy in U.S. history. Using his influence on politicians such as congressmen, territorial judges, and U.S. Surveyors General, Elkins was able to patent Spanish and Mexican land grants in his name, thereby illegally including himself as a legitimate heir to the grants. By collectively representing opposing parties in land disputes, Elkins and Catron effectively manipulated territorial government policy to illegally partition Spanish and Mexican land grants, a direct violation of the Treaty of Guadalupe Hidalgo.
West Virginia
Elkins married Hallie Davis, daughter of Senator Henry G. Davis of West Virginia, in 1875. He became a citizen of West Virginia in 1878 and began developing oil, coal, and timber industries with his father-in-law. They partnered to form the Davis Coal and Coke Company. Stephen and Hallie built their home, Halliehurst, in Randolph County, and the town of Elkins was established nearby. New York architect Charles T. Mott designed the house. It was given by his widow along with surrounding property to Davis and Elkins College and is now part of the college's campus. It is individually listed on the National Register of Historic Places and also is a contributing property in the Davis and Elkins Historic District.
Secretary of War
Elkins served as Secretary of War in the Benjamin Harrison administration from December 17, 1891 to March 5, 1893. Amongst his goals were that the rank of lieutenant general be revived, and also that noncommissioned officers receive higher pay to improve the quality of the service. He also broadened the intelligence functions of the Division of Military Information.
U.S. Senator
After his service as Secretary, Elkins was elected to the U.S. Senate in 1895, serving the state of West Virginia, and was re-elected twice. In the Senate, he held the positions of chairman of the Committee on the Geological Survey, and of member of the Committee on Interstate Commerce. Elkins served as Senator until his death in Washington, D.C. in 1911, and is interred in Maplewood Cemetery of Elkins, West Virginia.
Legacy
Stephen Benton Elkins is the namesake of Elkins, West Virginia.