 The regiment accompanied the corps trains to Rock Creek Church, near the battlefield, and two companies of the 12th went forward to protect ammunition trains on the Taneytown road.After the battle, the regiment moved south to Westminster, Maryland, then served as guards for a train of 2,500 Confederate prisoners who were taken to Baltimore, Maryland.Departing Baltimore, the regiment traveled to Brattleboro, Vermont, where it arrived on July 9.