Bill, the horse furniture or tack was taken from illustrations from period books and photographs. I think the US Army had different systems of "rigging" horses but the common ones in use for the British Army of the time were Royal Artillery and Army Service Corps. There were slight differences in the breast straps....heavier guns v wagons. These wagons are based on actual (original) drawings from 1915, courtesy of a very good friend who is a WW1 re-enactor and restorer of horse drawn equipment. These wagons were used by Commonwealth troops, but the US had their own styles. As for the period, there were limbered wagons used from the early 1900's so would have been used (possibly) in South Africa, (cannot be sure about this though). This model has the revised brakes introduces in 1915 "ish". I can furnish details if you want to contact me via Al.