Ken,
From what I can find A.S.Cabell was appointed Captain QM Dept.appointed Nov.8 and confirmed Dec.24,1861 at Richmond,Va. and reported to Col. A.C. Myers Acting QM CSA. He was tranfered to Steele's Division in 1863 and promoted to Major but this promotion was cancelled and he was assigned as AQM at Bonham,Texas. In July 1864, he appears on the returns of Post of San Antonio,Texas as QM with the rank of Major, he was there until at least Feb. 1865(last return found).
Mike