This unit is probably Hardeman's Regiment, Texas Cavalry. It was originally known as the 1st Regiment, Arizona Brigade and later as the 31st Texas Cavalry. The regiment served primarily in the Indian Territory. Company C was raised in Fannin County, Texas, but could have included some men from Grayson County. Unfortunately, there is only one company muster roll covering the period from September 22, 1862 to April 30, 1863.