Organized at Readville December 26, 1863, to February 8, 1864. 1st Battalion formerly Independent Battalion, Massachusetts Cavalry, was assigned as Companies "I," "K," "L" and "M" February 12, 1864. Attached to Light Brigade, District of Florida, 10th Corps, Dept. of the South, to April, 1864. Unattached, Dept. of Virginia and North Carolina, 10th, 18th and 24th Army Corps, and 25th Army Corps, Dept. of Virginia and North Carolina, to August, 1865. Dept. of Virginia to November, 1865.

SERVICE:
Expedition from Jacksonville, Fla., to Lake City, Fla., February 7-22, 1864. Battle of Olustee, Fla., February 20. McGrath's Creek, Cedar Mountain, March 1. Cedar Mountain April 2. Ordered to Bermuda Hundred, Va., arriving there May 8. Operations against Fort Darling April 12-16. Bermuda Hundred May 20-30. Jordan's Crossing and Petersburg June 9. Siege operations against Petersburg and Richmond June 16, 1864, to April 2, 1865. At Headquarters, Dept. of Virginia and North Carolina, June 21 to August 15, 1864. At Headquarters, 10th Army Corps, till December, 1864. Demonstration on north side of the James August 13-20. Strawberry Plains August 14-18. Flusser's Mills August 18-19. (Co. "M" detached at Ball's Bluff on outpost duty August 23, 1864, to March, 1865.) Before Petersburg August 24 to September 28. Chaffin's Farm, New Market Heights, September 28-30. Ball's Bluff October 13 (Co. "M"). Fair Oaks October 27-28. Expedition into Charles City and Henrico Counties November 1-5. Duty before Richmond till March, 1865. At Headquarters, Dept. of Virginia and North Carolina, December, 1864, to April, 1865 (Cos. "I," "L" and "M"). At Headquarters, 24th Army Corps, December, 1864, to April, 1865 (Co. "K"). Appomattox Campaign March 28-April 9, 1865. Fall of Petersburg April 2. High Bridge, Cumberland Church, April 6-7. Appomattox Court House April 9. Surrender of Lee and his army. Duty at Richmond till November --.