I have his service record. He is around 24 yo in 1861, 2nd Lt. Nathan Sexton. Co.G., 1st Choctaw - Chickasaw Rgmt. Colonel Tandy Walker.
In addition, I have an interesting document...Oct. 7, 1864. He is paid $100 by the Choctaw Nation at Choctaw City for what appears to be, "Attorney General." Was there such a thing as an Attorney General for the various Nations during the war? A Wm. Robuck is the Auditor.