Maj. Gen. John G. Walker's Texas Division consisted of three brigades. The nickname "Walker's Greyhounds" was given to the division because of it's fast deployment for a dismounted cavalry division:
1st Brigade (Waul's)
Brig. Gen. Thomas N. Waul brigade consisted of the following dismounted cavalry regiments which serfved as infantry:
12th Texas Cavalry
13th Texas Cavalry
18th Texas Cavalry
22nd Texas Cavalry
Haledman's Battery