The 1st Battery was organized in Portland, Maine and mustered in for three years of service on December 18, 1861.
[1] The battery was attached to 3rd Brigade, Department of the Gulf, until September 1862.
It was attached to Weitzel's Reserve Brigade, Department of the Gulf, until January 1863.
It then served at Camp Barry, Defenses of Washington, XXII Corps, until July 1864.
Moved from Ship Island, Miss., to New Orleans, La., May 8–15, and served provost duty there until September 1862.
Action with steamer Cotton, Bayou Teebe, January 14.
At Camp Stevens, Brashear City, and Bayou Boeuf until April.
Ordered to Tenleytown July 30, and joined XIX Corps at Monocacy Junction August 1.
Sheridan's Shenandoah Valley Campaign August 7 – November 28.
At Stevenson's Depot until January 14, 1865; at Manchester until April 14, and at Winchester until July 9.