Organized at Worcester and mustered in June 12, 1861. Moved to Washington, D. C., August 8-11. Attached to Gorman's Brigade, Stone's (Sedgwick's) Division, Army of the Potomac, to March, 1862. 1st Brigade, 2nd Division, 2nd Army Corps, Army of the Potomac, to July, 1864.

SERVICE:
At Camp Kalorama till August 25, 1861. March to Poolesville, Md., August 25-27. Picket and outpost duty on the Upper Potomac from Conrad's Ferry to Harrison's Island till October 20. Operations on the Potomac October 21-24. Battle of Ball's Bluff October 21. At Harper's Ferry and Bolivar Heights till March 7, 1862. At Charlestown till March 10. At Berryville till March 13. Movement toward Winchester and return to Bolivar Heights March 13-15. Moved to Fortress Monroe March 22-April 1. Siege of Yorktown April 5-May 4. Battle of Fair Oaks, Seven Pines, May 31-June 1. Seven days before Richmond June 25-July 1. Peach Orchard and Savage Station June 29. White Oak Swamp and Glendale June 30. Malvern Hill July 1. At Ball's Bluff till August 15. Movement to Alexandria August 15-28, and to Centreville August 29-30. Cover Pope's retreat August 31-September 1. Battle of Antietam, Md., September 16-17. Moved to Harper's Ferry September 22 and duty there till October 30. Movement to Falmouth, Va., October 30-November 20. Battle of Fredericksburg December 12-15. "Mud March" January 20-24, 1863. Chancellorsville Campaign April 27-May 6. Maryes Heights, Fredericksburg, May 3. Salem Heights May 3-4. Banks' Ford May 4. Battle of Gettysburg, Pa., July 2-4. Advance from the Rappahannock to the Rapidan September 13-17. Bristoe Campaign October 9-22. Bristoe Station October 14. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2. Robertson's Tavern or Locust Grove November 27. Morton's Ford February 6-7, 1864. Picketing Rapidan till May, 1864. Campaign from the Rapidan to the James May-June. Battles of the Wilderness May 5-7; Laurel Hill May 8; Spottsylvania May 8-12; Po River May 10; Spottsylvania Court House May 12-21. Assault on the Salient at Spottsylvania Court House May 12. North Anna River May 23-26. Line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Before Petersburg June 16-18. Siege of Petersburg June 16-July 12. Jerusalem Plank Road June 22-23. Left the front July 12. Mustered out July 28, 1864. Veterans and Recruits transferred to 20th Massachusetts.
Regiment lost during service 14 Officers and 227 Enlisted men killed and mortally wounded and 1 Officer and 121 Enlisted men by disease. Total 363.