In October 1863 the 14th Indiana rejoined the 2nd Corps, Army of the Potomac, and returned to active duty. Later that year the regiment participated in several battles in the eastern United States, including service in the Bristoe Campaign (October 9–22, 1863) and the Mine Run Campaign (November 26–December 2, 1863), before spending the winter at Stevensburg, Virginia. Fighting resumed in February 1864 along the Rapidan River.