Don Carlos Buell
On November 15, 1861 he was assigned as chief of staff to under Major General Don Carlos Buell. General Buell successively commanded the Department of the Ohio and the Army of the Ohio. In this assignment, Fry participated in the Battle of Shiloh and the Siege of Corinth in April and May 1862. Fry was promoted to the rank of major on April 22, 1862 and to lieutenant colonel on December 31 of the same year. On October 8, 1862 Fry participated in the Battle of Perryville, Kentucky.