Perhaps here's the answer to your query:
McGUIRE, Cornelius N. Pvt./1st Ltn. *Enr. 29 Apr 61 at Lincoln Co., aged 22; promoted to 2nd Ltn 27 Apr 62; promoted to 1st Ltn. on 17 June 62; wounded at Sharpsburg, MD, 17 Sept 62; killed at Fredericksburg, VA, 13 Dec 62.*
Here are some links to histories of the 1st Tennessee Infantry (Turney's) - PAC (Provisional Army of the Confederacy).
And here's where he is buried:
Hope this helps.