Speaking with your grandfather laste week he mentioned you were interested in relic hunting. Starke Miller, from Oxford, has a facebook page and is a local historian who is an expert on Ole Miss at the Battle of Shiloh. In December 1862, General Sherman had over 30,000 men camped in and around College Hill so that might be a fertile area for you to search with the land owners permission. If you contact Starke I am sure he might be of great assistance to you.
Good luck with your hunting!
Regards
David