Organized at
Portland, Maine, and mustered in on October 4, 1861. Left State for
Baltimore, Md, October 6. Attached to
Dix's Division to November, 1861. Railroad Brigade,
Army of the Potomac, to April, 1862. 1st Brigade,
Williams' Division, Dept. of the Shenandoah, to June, 1862. 1st Brigade, 1st Division, II Corps,
Army of Virginia, to September, 1862. 1st Brigade, 1st Division,
XII Corps,
Army of the Potomac, to April, 1863. Headquarters XII Corps, Armies of the Potomac and
Cumberland, to February, 1864. SERVICE.--Duty at Baltimore, Md., until November 4, 1861. At Relay House until November 27, and at
Baltimore until February 27, 1862. Guard duty by detachments along Baltimore & Ohio Railroad between Martinsburg and Charleston, W. Va., until May. Company "D" at
Harper's Ferry until May 24, then moved to Winchester. Company "F" at Harper's Ferry until May 9, then moved to
Winchester. Company "H" at Duffield's until May 24, then moved to Winchester. Company "K" at Kearneysville until May 24, then moved to Winchester. Company "C" at Van Obeiseville until May 9, then moved to Winchester. Company "A" at Opequan Bridge until May 24, then moved to Winchester. Company "B" at Martinsburg until May 24, then moved to Winchester. Company "E" at Halltown until May 9, then moved to Winchester. Companies "G" and "I" at Charleston until May 9, then moved to Winchester. All Companies at their stations from March 28. Operations in Shenandoah Valley May 15-June 17. Middletown May 24. Winchester May 25. Retreat to Williamsport May 25–27. Reconnaissance toward Martinsburg May 28. Reconnaissance to Luray C. H. June 29–30.
Battle of Cedar Mountain August 9. Pope's Campaign in Northern Virginia August 16-September 2. Guarding trains during
Second Bull Run battle.
Battle of Antietam, Md., September 16–17. Duty at Berlin, Md. (now Brunswick), October 3-December 10. March to Fairfax Station December 10–14, and duty there until January 19, 1863. March to Stafford C. H. January 19–23, and duty there until April 27. Ordered to rear for muster out April 27. Three-year men formed into a battalion of three companies (A, B, and D) and assigned to duty at Headquarters
XII Corps April 26 as the 10th Maine Infantry Battalion. Old members mustered out May 8, 1863, at Portland, Maine. Chancellorsville Campaign April 27-May 6.
Battle of Chancellorsville May 1–5. Gettysburg (Pa.) Campaign June 13-July 24. Provost duty at
Battle of Gettysburg July 1–3. Along the Rapidan August 1-September 24. Moved to
Nashville, Tenn., September 24-October 2; to
Murfreesboro, Tenn., October 5, thence to Shelbyville and Wartrace. Reopening Tennessee River October 26–29. Provost duty at Headquarters XII Corps until February. Detached from XII Corps at Tullahoma, Tenn. February 29, 1864, to be amalgamated with the 29th Maine Infantry, which occurred May 29, 1864, at Morganza, La. == Casualties ==