Organized in the field September, 1862, by consolidation of Keys' Washington (Pa.) Cavalry Company, organized at Washington, Pa., June 29, 1861; Work's Washington County Company, organized September 6, 1862; Young's Cavalry, organized September 6, 1862; Barr's Cavalry Company, organized October 13, 1862, and Chessrown's Cavalry Company, organized October 14, 1862. Attached to Railroad District, 8th Corps, Middle Dept., to January, 1863. Romney, W. Va., Defenses Upper Potomac, 8th Corps, Middle Dept., to March, 1863. 4th Brigade, 1st Division, 8th Corps, to June, 1863. Campbell's Brigade, Scammon's Division, Dept. West Virginia, to December, 1863. 2nd Brigade, 2nd Division, West Virginia, to February, 1864.
SERVICE.---Guard and scout duty in the Railroad District and on Upper Potomac, West Virginia, until February, 1864. Actions: Ridgeville Road, near Petersburg, W. Va., October 29, 1862; Moorefield, South Fork Potomac, November 9; Moorefield December 3; near Romney February 16, 1863; near Burlington April 6-7; Purgetsville and Going's Ford April 6-7; Burlington April 26; Moorefield September 4 and 11. Descent upon Salem, Va., December 16. Jackson River, near Covington, December 19. Operations in Hampshire and Hardy Counties, W. Va., December 31, 1863-January 5, 1864, and January 27-February 5. Medley, Williamsport, January 29-30. Evacuation of Petersburg January 30. Moorefield February 4. Expedition to Petersburg February 29-March 5. Petersburg March 3. Transferred to 22nd Pennsylvania Cavalry February 22, 1864.
Lost during service 3 Enlisted men killed and mortally wounded and 1 Officer and 18 Enlisted men by disease. Total 22.