The 1st Battery mustered into United States service on February 18, 1862, with 154 men, and gained 63 recruits during its career.
Other losses included 36 honorably discharged, 51 transferred to the Veteran Reserve Corps or other organizations, and 3 men who deserted.
Pythagorus E. Holcomb, of Ohio, assumed command of the battery in Sayles' stead, but was promoted to major in the 1st Texas Cavalry in August 1863.
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 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.
The 3rd Battery mustered into United States service on January 1, 1864, with 151 men, and gained 105 recruits during its career.
The company suffered 4 men who died of disease, 1 who committed suicide, 7 who were discharged for disability, and 1 who deserted.