Pegram's brigade joined the Army of Tennessee and Ashby's regiment helped destroy a Union Army wagon train at the Battle of Stones River (December 31, 1862, January 2, 1863). The brigade then again engaged in independent operations in Kentucky. The brigade again fought with the Army of Tennessee at the Battle of Chickamauga on September 19 and 20, 1863. Pegram transferred to the Army of Northern Virginia after the battle but Ashby and his regiment remained with the Army of Tennessee.