The battery served in the defenses of Washington until March 17, 1862, when it was sent south to serve in the Peninsula Campaign. The battery was assigned to Brig. Gen.William F. Smith's division of the Army of the Potomac in January of that year, and the division had joined the IV Corps in March 1862. The division joined the VI Corps when it was formed in May 1862. It first saw combat under Capt. Mott at the Battle of Yorktown, and it was heavily engaged in the Battle of Williamsburg. The battery was engaged during the Seven Days Battles, including at the Battle of White Oak Swamp and the Battle of Malvern Hill. Mott resigned soon thereafter. Lt. William Stuart was in command in the Maryland Campaign, in which the battery served with the division of Brig. Gen. Darius N. Couch