Army of the Potomac
The regiment was attached to the Department of the South to April 1862. 3rd Brigade, 1st Division, Department of the South, to August 1862. Companies A through H moved to Fort Monroe August 19, 1862, then moved to Washington, D.C., and joined Pleasanton's Cavalry, Army of the Potomac, at Tenallytown, September 3. Attached to Pleasanton's Cavalry, Army of the Potomac, to October 1862. Averill's Brigade, Cavalry Division, Army of the Potomac, to January 1863. 1st Brigade, 2nd Division, Cavalry Corps, Army of the Potomac, to April 1865. Four new companies (I, K, L, and M) were organized December 5. 1863 to January 14, 1864. Provost Marshal's Command, Army of the Potomac, to May 1865. Headquarters, Army of the Potomac, to June 1865.