Colonel Robert R. Garlands Brigade was formed at Camp White Sulphur Springs near Pine Bluff Arkansas in August 1862. It consisted of Garland's 6th Texas Infantry, the 24th and 25th Texas Cavalry which had been dismounted and converted to Infantry. It was joined by William Hart's (Dallas) Battery of Arkansas Artillery. The Brigade was assigned to the defence of the Lower Arkansas River Valley at Arkansas Post in mid to late September 1862.

The 25th Texas Cavalry had in fact been scattered from Shrevesport, to Arkansas Post due to severe illnesses. Many of the men had been in the hospitals at either Shrevesport or Camp White Sulphur Springs. Most were able to rejoin their regiment just before the battle of Arkansas Post.