In the spring of 1862 he was detailed Assistant Adjutant General of the Twenty-third Brigade, Army of the Cumberland. In the campaign from Nashville to Chattanooga, 1863, he was attached to the headquarters of General George H. Thomas, and given command of the mounted Provost Guard of the Eleventh Army Corps, the members of which he was allowed to select, and took an active part in all the important battles of that campaign, including Stone River and Chickamauga, where he was wounded. During the Siege of Chattanooga, October 23, 1863, by the Confederate forces under General Braxton Bragg, he was promoted Post Adjutant.