GENERAL ORDERS, ADJT. AND INSP. General 'S OFFICE, Numbers 15. Richmond, Va., October 22, 1861 states that “Fifth Brigade, Brigadier-General Wigfall, to consist of three Texas regiments and one Louisiana regiment.” (OFFICIAL RECORDS: Series 1, vol 5, Part 1 West Virginia )

Does anyone know which Louisiana regiment this might be? I realize that it was soon replaced with the 18th Georgia but need to know what La unit this was and why it was replaced.