Confederate brigadier general (1823–1891) who commanded the 8th Texas Cavalry Regiment of the Confederate States Army. Rare Civil War–dated ALS in pencil, signed "Thos. Harrison, Col," one page, lightly-lined both sides, 4.75 x 7.5, July 28, 1864. Letter written below a request from George Deerhard which reads, "Genl. [William Hicks] Jackson countermands the move for the present as the enemy are pressing Gen. [Frank] Armstrong & has directed that Col. Hobson & Col. McKenzie report to him for the time." Underneath, Harrison writes: "I enclose the above for your information. I suppose it is my duty to obey. The Brig. is up with me, the only chance being that you may influence Genl. [Joseph] Wheeler. I know you will do what you can. I would be spared this humiliation if possible. I feel that I do not deserve it." A docketing notation is on the reverse in Deerhard's hand allowing a courier to pass to headquarters. In very good condition, with scattered toning and creasing, and all text fairly light, but still legible.