Organized at Bangor for three months' service. Left State for Willett's Point, N. Y., May 14, 1861. Mustered into U. S. service for two and three years May 28, 1861. Moved to Washington, D. C., May 30. Attached to Keyes' Brigade, Tyler's Division, McDowell's Army of Northeastern Virginia, June to August, 1861. Fort Corcoran, Division of the Potomac, to October, 1861. Martindale's Brigade, Fitz-John Porter's Division, Army Potomac, to March, 1862. 1st Brigade, 1st Division, 3rd Army Corps, Army Potomac, to May, 1862. 1st Brigade, 1st Division, 3rd Army Corps, to June, 1863.
SERVICE-Camp on Meridian Hill, Defences of Washington, D. C., till July 1, 1861. Moved to Falls Church, Va., July 1, and duty there till July 16. Advance on Manassas, Va., July 16-21. Occupation of Fairfax C. H. July 17. Battle of Bull Run July 21. Duty at Arlington Heights, Va., and at Fort Corcoran till October, and at Hall's Hill, Defences of Washington, till March, 1862. Moved to the Peninsula March. Warwick Road and near Lee's Mills April 5. Siege of Yorktown April 5-May 4. New Bridge May 24. Hanover C. H. May 27. Operations about Hanover C. H. May 27-29. Seven days before Richmond June 25-July 1. Battles of Mechanicsville June 26; Gaines' Mill June 27; Peach Orchard and Savage Station June 29; Turkey Bridge or Malvern Cliff June 30; Malvern Hill July 1. At Harrison Landing till August 15. Retreat from the Peninsula and movement to Centreville August 16-27. Pope's Campaign in Northern Virginia August 27-September 2. Battle of Groveton August 29. Bull Run August 30. Battle of Antietam, Md., September 16-17. Shephardstown Ford September 19. Shephardstown September 20. Battle of Fredericksburg, Va., December 12-15. Expedition to Richards and Ellis Fords December 29-30. "Mud March" January 20-24. 1863. At Falmouth till April. Chancellorsville Campaign April 27-May 6. Battle of Chancellorsville May 1-5. Ordered home May 20. Three-year men transferred to 20th Maine Infantry. Mustered out June 9, 1863.

Regiment lost during service 4 Officers and 65 Enlisted men killed and mortally wounded and 70 Enlisted men by disease. Total 139.