I have some additional information on the 27th TX Cav. (1st TX Legion) from Cute's Compendium. There were reportedly 460 men present at the Battle of Iuka and they sustained 22% (101) casualties. Evidently, 22 of them died.

On a personal note, my gg-uncle was a 41 year old private in Co. K. He was captured at Hatchie Bridge and joined the Texas State Troops rather than re-enlist after his parole. I think he saw a lot of action in his time of service. And Texian Cavalry soldiers resented being dismounted, which was their mode of operation in the Iuka-Corinth Campaign.