The earliest depiction of vehicles in the context of warfare is on the Standard of Ur in southern Mesopotamia, c. 2500 BC. These are more properly called wagons or carts and were double-axled and pulled by oxen or a hybrid of a donkey and a female onager, named Kunga in the city of Nagar which was famous for breeding them. The hybrids were used by the Eblaite, early Sumerian, Akkadian and Ur III armies. Although sometimes carrying a spearman with the charioteer (driver), such heavy wagons, borne on solid wooden wheels and covered with skins, may have been part of the baggage train (e.g., during royal funeral processions) rather than vehicles of battle in themselves.