There is only one muster roll for Captain Andrew Young's Company (Alleghany Troopers), Georgia Cavalry, which was mustered in by Colonel T. J. Haralson, August 1, 1863 at Blairsville, Georgia, to serve for a period of six months within the limits of the State
M266: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Georgia, Roll 74
It was apparently composed of only 68 men, see: http://www.researchonline.net/gacw/gaunits.htm