Organized at Concord and mustered in September 2, 1862. Moved to Washington, D.C., September 11-14, 1862. Attached to Brigg's Brigade, Casey's Division, Military District of Washington, to October, 1862. 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to March, 1863. 2nd Brigade, 2nd Division, 9th Army Corps, Dept. of Ohio, to June, 1863. 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Tennessee, to August, 1863. 2nd Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to April, 1864. 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to June, 1865.

SERVICE.--Moved to Pleasant Valley, Md., October 4, and duty there until October 27, 1862. Movement to Falmouth, Va., October 27-November 19. Battle of Fredericksburg, Va., December 12-15. Burnside's Second Campaign ("Mud March") January 20-24, 1863. Moved to Newport News February 11, thence to Covington, Ky., March 26-April 1. Duty at various points in Kentucky until June. Moved to Vicksburg, Miss., June 4-14. Siege of Vicksburg, Miss., June 14-July 4. Advance on Jackson, Miss., July 4-10. Siege of Jackson, Miss., July 10-17. Destruction of Railroad at Madison Station July 18-22. At Milldale, Miss., until August 6. Moved to Cincinnati, Ohio, August 6-14. At Covington, Ky., until August 26, and at Nicholasville, Camp Parke, Crab Orchard and Loudon until October. March to Knoxville, Tenn., October 12-29. Knoxville Campaign November 4-December 23. Campbell Station November 16. Siege of Knoxville November 17-December 4. Repulse of Longstreet's assault on Fort Saunders November 29. Duty in East Tennessee until March, 1864. Moved to Annapolis, Md., March 18-April 7. Campaign from the Rapidan to the James River, Va., May 3-June 15. Battles of the Wilderness May 5-7. Spotsylvania May 8-12. Spotsylvania Court House May 12-21. Assault on the Salient, Spotsylvania C. H., May 12. North Anna River May 23-26. On line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Bethesda Church June 1-3. Before Petersburg June 15-19. Siege of Petersburg June 16, 1864, to April 2, 1865. Mine Explosion, Petersburg, July 30, 1864. Weldon Railroad August 18-21. Poplar Springs Church September 29-October 2. Boydton Plank Road, Hatcher's Run, October 27-28. Fort Stedman March 25, 1865. Appomattox Campaign March 28-April 9. Assault on and fall of Petersburg April 2. Occupation of Petersburg April 3. Pursuit of Lee April 3-9. Moved to Washington, D.C., April 20-27, and duty at Alexandria until June. Grand Review May 23. Mustered out June 4, 1865.