This explains the 8TH Texas Cavalry references.
The 11TH Tex cav. continued to serve as dismounted cavalry through several deadly battles until after the Battle at Chickamauga (September 1863) where they were incorporated into Major General Joseph Wheeler's cavalry corps and remounted. For the remainder of the war, the men of the Eleventh Texas cavalry were brigaded with the 8th Texas cavalry and served in virtually every major engagement of the Army of Tennessee.