 Original members mustered out on September 20, 1864, and recruits were reorganized as the 1st Company Heavy Artillery, Vermont Volunteers, on March 1, 1865.The battery mustered out of serve on July 31, 1865.The battery was engaged at Plain's Store, Louisiana, May 21, 1863, the Siege of Port Hudson, from May 25 to July 9, 1863, and Jackson, August 3, 1863.