De Lancey Floyd-Jones of New York was a career officer in the United States Army, rising from the rank of second lieutenant upon graduation from the United States Military Academy in 1846 to the rank of colonel at his retirement in 1879. He served in the Mexican War and the Civil War, earning brevet promotions in both wars for gallantry in combat. During the Mexican War, Floyd-Jones served in the garrison force at Monterrey, participated in the battles of Veracruz and Cerro Gordo and the campaign against Mexico City, and served in the occupation force at Mexico City. During the Civil War, Floyd-Jones participated in many campaigns, including the Peninsular Campaign in Virginia in 1862. Following the Civil War and until his retirement from the Army in March 1879, Colonel Floyd-Jones served at Detroit and in Kentucky, Mississippi, Louisiana, Arkansas, Montana, Idaho Territory, and Indian Territory. He was Superintendent of Indian Affairs in Idaho Territory from June 1869 to November 1870. He retired from the Army as a full colonel. After his retirement, Colonel Floyd-Jones was elected a member of the Aztec Club of 1847, a military society for veterans of the Mexican War and their descendants. He served as vice president of the club in 1894-1895 and as president in 1895-1896. Floyd-Jones died on January 19, 1902, in New York City.
From the description of De Lancey Floyd-Jones letters, 1846-1862 (University of Texas at Arlington). WorldCat record id: 743757849
