For information about Camp Morton (Indianapolis IN) is available here --
If I'm not mistaken, Lieut. Col. William S. Wilson was an attorney from Port Gibson MS, mortally wounded at Sharpsburg MD, Sept. 17, 1862, and died in Federal hands.
William S. Wilson, a Cumberland Presbyterian minister from Pontotoc County MS, enlisted in the "Reub Davis Rebels" and was appointed 1st Sergeant. This unit was assigned to Simonton's 1st Mississippi Regiment as Co. "C". Evidently Wilson survived the war in reduced circumstances, as he appears as a farm laborer on the 1870 census of Mississippi in Lee County (created in part from Pototoc County).
Company names such as the "Reub Davis Rebels" were not issued under copyright and were often borrowed by more than one company. You may have seen a list of original members of a ninety-day Mississippi company by that same name, but this is a different military unit.
Copies of Wilson's military service file are available here --