I am assuming your ancestor was Captain R. F. Morris, Co. "F", 33^rd Tennessee Regiment. Here's a history of the regiment --

http://www.tngennet.org/civilwar/csainf/csa33.html

The military service records for Captain Morris will provide further details. You can order copies by clicking on the link outlined in red at the top of this page.

In the interim between Shiloh and Bragg's retreat from Corinth MS, there was no major battle here. Unfortunately contaminated water and poor health facilities led to the death of many Southern solders camped around the town. I would guess that's we are told in Capt. Morris' service file.

Below is Conrad Wise Chapman's famous painting of men of the 3rd Kentucky Regiment in camp near Corinth MS, May 10, 1862.