This is the only A. G. Weston I could find in Confederate records. No rank was given in this record. Nor is his name listed in the rosters of the 1st Mississippi Cavalry.

A. G. Weston, Company B, 1st Regiment Mississippi Cavalry, horse was hit with a shell & musket ball - so injured that he was compelled to abandon him, April 6/7, 1862 in the engagement at Shiloh, Tenn., no other records

M347: Unfiled Papers and Slips Belonging in Confederate Compiled Service Records