The common Confederate-made halter intended for wagon mules found its way onto artillery horses quite frequently.  Even in U.S. batteries rope halters were sometimes used, as fresh horses were delivered to the army by the Quartermaster's Department with them on, and some ended up being added to battery equipment inventories.  If you're working on getting a lot of expensive harness together and need to save a bit of cash somewhere, start by getting these halters for the time being.  Halters come complete with a rope lead.