He did not remain an infantry captain for the entire war. Records show that the company was formed with Davis (age 52) as captain April 25, 1861, at Crystal Springs. It was mustered in to Confederate service at Corinth on May 26, 1861, and proceeded to Virginia soon afterward. Papers in his file reveal that he applied for captaincy in the regular army on Feb. 11, 1862, a request that evidently was not honored. He was paid as a captain ($390) for the period Jan-Mar. 1862, and then on April 26, he was relieved from duty and a separate card says he was dropped on May 21. There was no explanation. One additional record is found in his file which is most likely someone else. A private James Davis of Co. C. was paid on Jul 7, 1864, in Raleigh, based on a descriptive list furnished by a surgeon at Wayside Hospital, Selma, AL.
Evidently Davis returned to Mississippi. I believe that this is the same man: 1st Lieut. James C. Davis, Drill Master, Camp of Instruction, Brookhaven, Mississippi. Appointed by Secretary of War Randolph on Oct. 31, 1862, to take rank Aug. 17, 1862, accepted Nov. 25, 1862. This individual resigned on Sept. 1, 1863. His resignation was not immediatly approved, and was sent back to ascertain the reason. A letter then written on Oct. 2, at Enterprise, to his commanding officer, gave his reasons as 1. Age - "being now in my 55th year, and having been in the service of the Confederate States since the beginning of the war." and 2. Sickness - "having for the last ten months been afflicted with chronic chills and fevers - rendering me unfit for service."