companies of soldiers who had enlisted for three, rather than two, years and the unit was known as the 10th Maine Battalion. The soldiers of the 10th Maine Battalion were absorbed into the 29th Maine (formed in December 1863) in May 1864. Many soldiers who had served in the 10th Maine Regiment re-enlisted in the 29th Maine. This was the basis of the claim that the 1st, 10th and 29th Maine Regiments were, effectively, the same unit. An historian of the 240th AAA (Anti-Aircraft Artillery) Group, a former Maine Army National Guard unit, has concluded that numerous subsequent Volunteer Maine Militia and Maine National Guard units, including the 29th Maine, inherited the lineage of the 1st Maine via the Portland Light Infantry company. From 1924 through 1944 this lineage was carried by the 240th Coast Artillery Regiment. As of 2018 this lineage is carried by the 240th Regional Training Institute, Maine Army National Guard, in Bangor. The 29th Maine is also one of the "ancestor" units, along with the famed 20th Maine Volunteer Infantry Regiment, of the modern day 133rd Engineer Battalion of the Maine Army National Guard. Commanders Colonel George Lafayette Beal – December 17, 1863 – April 19, 1864 (reassigned as brigade commander) Lieutenant Colonel Charles S. Emerson (acting commander) – April 19, 1864 – August 27, 1864 (relieved due to illness) Major William Knowlton – August 27, 1864 – September 20, 1864 (died of wounds received at Opequon) Colonel George H. Nye – September 20, 1864 – June 29, 1866 (mustered out with the regiment) See also List of Maine Civil War units Maine in the American Civil War 1st Maine Volunteer Infantry Regiment 10th Maine Volunteer Infantry Regiment Notes References Attribution External links History of the 1st-10th-29th Maine Regiment Online Units descended from 1st Maine 29th Maine US Flag Image 29th Maine Unit Flag Image Military units and formations established in 1863 Military units and formations disestablished in 1866 Units and formations of the Union Army from Maine 1863 establishments in Maine