One of eight regiments raised by Maine in the fall of 1862 under the call for men to serve nine-month terms, the 27th Maine was formed primarily of volunteers from
York County, Maine. They went into camp at
Portland, Maine, on 10 September, with the officers being mustered into service on the 19th and the enlisted men on the 30th. After a short furlough home, and the addition of a few later enlistments to complete the regiment, they left for
Washington, D.C. on 20 October 1862. The unit was attached to the
XXII Corps, first belonging to
Casey's Division and later to the division of General
John Joseph Abercrombie. They served as pickets in the defenses of the capital through their entire term. First encamped on East
Capitol Hill upon their arrival in Washington, they soon moved to
Arlington Heights,
Virginia and afterward to
Hunting Creek, where they went into winter quarters until March 1863. In the spring, they relocated along with the
25th Maine to
Chantilly, Virginia and were there until 25 June, when they were transferred into the
Army of the Potomac and ordered to report to
General Slocum and the
XII Corps at
Leesburg, Virginia. This order was quickly changed, as it had not been known that the 1st Brigade (25th Maine and 27th Maine) were only nine-month units and their terms were about to expire, so they were instead sent to Arlington Heights for preparations to their mustering out and subsequent return to Maine. ==Volunteer service and the Medal of Honor==