Andrew Chambless (born abt 1822)and Emily (Millie, Milley)are found in Sumter Co. GA on the 1850 & 1860 censuses. On the 1870 Andrew is not listed. In a Confederate Roster I found a listing for Andrew D. Chambless, GA 9th Inf, Co. E (Sumter Artillery). Private, June 11, 1861. Appointed 1st Sgt Oct 11, 1861. One detail duty at Corps Headquarters Dec. 1864. AOL Dec 20, 1864-Feb 28, 1865. No later record. Things add up, but I really have no proof that he is the right one.
From the Henry Chambless Bible, Georgia Bible Records by Austen: Another Andrew D. Chambless was born 4 July 1822 Warren Co. GA and died 10 Aug 1860 Talbot Co. GA. His parents were Henry Chambless and Rachel Danielly. More info is in Ancestral File and IGI. I did not copy all of it after I determined it was not the family I needed.