One of my ggg grandfathers was in the 17th Battlion Tenn Cavalry, which was mounted in Armstrong's Brigade during the Corinth operation. The 6th Texas Cavalry, and other Texas cavalry regiments, had been dismounted and attached to various infantry brigades sometime previous, I believe due to a lack of horses.

Van Dorn took the army to the Holly Springs area (NW Mississippi) after Corinth/Hatchee River. Sometime fairly soon thereafter, horses were obtained for the Texas cavalry regiments in Van Dorn's army. The 6th Texas, 3rd Texas, and 9th Texas Cavalry and Whitfield's Texas Legion were formed in a brigade under Col. Griffith. This brigade fought with Union cavalry around Oakland Mississippi, in early December 1862, during Grant's advance south for Memphis. It was Griffith that came up with the idea of attacking Grant's supply base at Holly Sprngs, and Pemberton approved the plan and put Van Dorn in charge of the cavalry. Griffith's Brigade (inc. 6th Texas) participated in the Holly Springs raid in mid to late December. After destroying the base, then moving into southwest Tenenssee to destroy track, the Confederate force retruned to Pemberton's army around Grenada, Mississippi, a few days after Christmas.

A January 20, 1863 report still shows the Texas Cavalry Brigade with Van Dorn's Cavalry Corps around Grenada. In February 1863, Van Dorn took his corps (four brigades) into middle Tennessee and joind with Forrest's Brigade. The Texas brigade (now lead by Whitfield) containing the 6th Texas and Armstrong's and Forrest's Brigades defeated Union troops at Thompson's Station in early March. The Texas brigade first stopped a Union infanrty charge, then counter-attacked on foot. Some of Van Dorn's and Forrest's troops (although I don't believe the Texas brigade) also fought sizable actions at Brentwood and near Franklin over the next several weeks. Van Dorn made Spring Hill his HQ, and he was murdered there in early May 1863.

The Texas briagde containing the 6th Texas was eventually commanded by Sul Ross. The brigade returned to Mississippi in late May 1863, and generally stayed in teh Jackson area during the next 11 months. In early 1864, it fought with Sherman's force as it advanced to Meridian and back from Vicksburg. Around May 1864, the brigade went to Georgia as a part of Jackson's Division. It participated in the Atlanta campain, generally on the OCnfederate left flank in teh first half of the operation; it later played a major role in stopping Union cavalry raids south of Atlanta in August. It returned to Tennessee in November 1864, as part of Hood's Army of Tennessee, and feell back with the rest of the army to NE Mississippi after the battle at Nashville. I think it remained in Mississippi and Alabama for the rest of the war.