Twenty-five yeard old Gilbert Phelps enlisted with the 67th New York, 1st Long Island Volunteers on May 27, 1861 at Rochester, NY. He mustered in as a Wagoneer in Company H on June 24th.
Mr. Phelps was promoted to Sergeant (February 20, 1862), First Sergeant (October 19, 1862), Second Lieutenant (Christmas 1862), and finally First Lieutenant of Company G on September 28, 1863. On July 4, 1864, Lieutenant Phelps Mustered Out with the rest of the 67th NY at New York City.
Information provided by American Civil War Research Database and the publication New York in the War of the Rebellion 1861-1865 by Frederick Phisterer (1912)