Organized at Augusta, Me., August 21, 1861, from companies recruited in various parts of the State. It proceeded immediately to Baltimore, and thence, after a two weeks' stay, to Washington. It encamped there two weeks, and then, on Nov. 7, 1861, marched to Lewinsville, Va., where it performed outpost duty until the spring of 1862. It joined in the advance on Manassas, and then embarked for the Peninsula. It was then in Davidson's (3d) Brigade, Wm F. Smith's Division, Fourth Corps; this division was transferred in May to the newly-formed Sixth Corps. The loss by disease and sickness was so great that the regiment took only 181 men into action at Antietam; it was commanded in that battle by Major Hyde, and lost there 12 killed, 63 wounded, and 20 missing, -- over half of those engaged. Becoming much reduced in numbers, it was ordered home to Maine, in October, 1862, to recruit. Five companies -- B, C, D, I and K -- under command of Lt.-Col. Selden Conner, rejoined the corps in January, 1863, and were engaged at Fredericksburg, May 3, 1863, with a loss of 12 killed, 49 wounded, and 31 missing. In May, 1864, the regiment -- then in Getty's Division -- entered the Wilderness campaign, where it took part in the bloody contest which was waged by the Sixth Corps. From May 5th to May 18th, it lost 310 in killed and wounded. Its last battle occurred at Fort Stevens, within the city limits of Washington, where it assisted in repulsing Early's attack. Major Jones was killed in this action. Its term of service expired August 21, 1864, while in the Shenandoah, and the recruits were transferred to the First Maine Veteran Infantry.