You were right. I retrieved Oscar's military records,
and obtained the info that I wanted:
Oscar E. Stuart - Student at The University of Mississippi at the time of his enlistment.
Enlisted in the 18th Miss. Co. K (Burt's Rifles)-April 1861
Promoted to Sgt. Major by Col. Burt - June 1861
Appointed as 1st Lt. Adjutant - Nov 1862
Died in Battle Marye's Heights - May 3 1863