Organized at Concord and mustered in August 15, 1862, Left State for Washington, D.C., August 25, 1862. At Arlington Heights, Va., until September 6. March to Monocacy River to join army September 6-13. Attached to 1st Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to March, 1863. 1st Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to June, 1863. 1st Brigade, 2nd Division, 9th Army Corps, Army of the Tennessee, to September, 1863. District of North Central Kentucky, 1st Division, 23rd Army Corps, Dept. of the Ohio, to February, 1864. 1st Brigade, 2nd Division, 9th Army Corps, Army of Ohio, to April, 1864. 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to June, 1865.

SERVICE.--Battle of South Mountain, Md., September 14, 1862. Battle of Antietam, Md., September 16-17. Duty in Pleasant Valley, Md., until October 27, 1862. Movement to Falmouth, Va., October 27-November 19. Waterloo Bridge November 9-10. Battle of Fredericksburg, Va., December 12-15. Burnside's Second Campaign, "Mud March," January 20-24, 1863. Moved to Newport News, Va., February 11; thence to Lexington, Ky., March 25-31, Duty in the Blue Grass Region of Kentucky until June. Moved to Vicksburg, Miss., June 3-14. Siege of Vicksburg, Miss., June 14-July 4. Advance on Jackson, Miss., July 4-10. Siege of Jackson, Miss., July 10-17. At Milldale, Miss., until August 10. Moved to Covington, Ky., August 10-21; thence to Camp Nelson, Ky., August 25. Duty guarding railroad between Cincinnati, Ohio, and Camp Nelson, Ky., until January, 1864. Moved to Camp Burnside January 15. March to Knoxville, Tenn., February 19-March 17. March across Cumberland Mountains to Camp Burnside and Nicholasville, Ky., March 21-31. Moved to Annapolis, Md., April 2-5. 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 at Spotsylvania Court House 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 16-19. 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. Garrison, Fort Alexander Hays, until April, 1865. Appomattox Campaign March 28-April 9. Assault on and fall of Petersburg April 2. Occupation of Petersburg April 3. Pursuit of Lee April 3-6. Detached to guard Ewell's Army April 6. Moved to Alexandria April 20-27 and duty there until June. Grand Review May 23. Mustered out June 10, 1865. Recruits transferred to 6th New Hampshire Infantry.