A Goggle search: "28th Texas Cavalry" will yield you more than you're looking for.

Seaton, a resident of Rusk Co., Texas, enlisted May 5, 1863 at Wood Co. , Texas. He is listed as being with "D. S. Q. M. Dept, Tyler, Texas" on their Regimental Return of April 16, 1864 per "S. O. Dept. Hd Qrs".

He was recorded as a POW with the army surrendered by Kirby Smith on May 26, 1865 at New Orleans, La.

George Martin