Organized at Rockland and mustered in June 15, 1861. Left State for Washington, D. C., June 20. Attached to Howard's Brigade, Heintzelman's Division, McDowell's Army of Northeastern Virginia, to August, 1861. Heintzelman's Brigade, Division of the Potomac, to October, 1861. Sedgwick's Brigade, Heintzelman's Division, Army of the Potomac, to March, 1862. 2nd Brigade, 3rd Division, 3rd Army Corps, Army Potomac, to July, 1862. 2nd Brigade, 1st Division, 3rd Army Corps, to March, 1864. 2nd Brigade, 3rd Division, 2nd Corps, to May, 1864. 1st Brigade, 3rd Division, 2nd Army Corps, to June, 1864.
SERVlCE-Camp on Meridian Hill, Defences of Washington, till July 16, 1861. Advance on Manassas, Va., July 16-21. Battle of Bull Run July 21. Duty in the Defences of Washington, D. C.,till March, 1862. Advance on Manassas, Va., March 10-15. Moved to the Peninsula March 17. Peninsula Campaign April to August. Siege of Yorktown April 5-May 4. Battle of Williamsburg May 5. Battle of Seven Pines or Fair Oaks May 31-June 1. Near Richmond June 18. Seven days before Richmond June 25-July 1. Oak Grove June 25. Charles City Cross Roads and Glendale June 30. Malvern Hill July 1. At Harrison Landing till August 16. Retreat from the Peninsula and movement to Centreville August 16-27. Pope's Campaign in Northern Virginia August 27-September 2. Battles of Groveton August 29; Bull Run August 30; Chantilly September 1. Guard fords from Monocacy River to Conrad's Ferry till October 11. March to Leesburg, thence to Falmouth, Va., October 11-November 23. Mouth of Monocacy, White's Ford, October 12. Battle of Fredericksburg, Va., December 12-15. "Mud March" January 20-24, 1863. At Falmouth till April 27. Chancellorsville Campaign April 27-May 6. Battle of Chancellorsville May 1-5. Gettysburg (Pa.) Campaign June 13-July 24. Battle of Gettysburg July 1-3. Pursuit of Lee July 5-23. Wapping Heights, Va., July 23. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Kelly's Ford November 7. Mine Run Campaign November 26-December 2. Payne's Farm November 27. Demonstration on the Rapidan February 6-7, 1864. Campaign from the Rapidan to the James River May 3-June 15. Battles of the Wilderness May 5-7. Laurel Hill May 8. Spottsylvania May 8-12. Po River May 10. Spottsylvania C. H. May 12-21. "Bloody Angle," Assault on the Salient, May 12. Harris Farm, Fredericksburg Road, May 19. North Anna River May 23-26. On line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Before Petersburg June 15. Ordered to the rear June 15. Mustered out July 19, 1864, expiration of term. Veterans and recruits transferred to 19th Maine Infantry.

Regiment lost during service 14 Officers and 156 Enlisted men killed and mortally wounded and 2 Officers and 185 Enlisted men by disease. Total 307.