State volunteer units in Federal service

1st Connecticut Cavalry

The 1st Regiment Cavalry, Connecticut Volunteers was originally raised in November 1861 as the 1st Battalion Connecticut Cavalry, and campaigned in West Virginia, the Shenandoah Valley, and the Second Battle of Bull Run. In September 1863, authorized to expand to a regiment, the 1st Connecticut Cavalry while on Provost Guard at Camp Chesebrough in Baltimore, recruited 82 replacements from among Confederate prisoners kept at Fort Delaware, placing most in Company G (organized October 5, 1863) and spreading the rest throughout the regiment. In the spring of 1864 Gen. Grant directed that all units containing former Confederates would be employed on the western frontier. All of the former Confederates in the 1st Connecticut Cavalry were placed into Company G[n 19] and on April 26, 1864, sent to Fort Snelling, Minnesota, also serving at Forts Ridgely and Ripley. On April 6, 1865, the remaining 40 former Confederates of the company transferred to the U.S. Volunteers and were designated the 1st Independent Company, U.S.V..[n 20] The 1st Independent Company remained on duty in the District of Minnesota until mustered out on November 16, 1865.[27][28]

https://en.wikipedia.org/wiki/Galvanized_Yankees