It's not much, but in the source: Confederate Reminiscences and Letters 1861-1865, Georgia Division, United Daughters of the Confederacy, vol. XIV, 2000, p. 167 is an entry on Capt. James Marion Jackson, which begins, "My father, J. M. Jackson, enlisted in West Armuchee, Walker County, Georgia, in April 1861. He was mustered into service at Atlanta the last of May 1861 and went out as Brevet Lieutenant of the 11th Regiment, Company G of Georgia Infantry. He was promoted to Second Lieutenant in October 1861, First Lieutenant in July 1862, and Captain in August 1864."