Terracotta moulds were mass produced in southern Mesopotamia. They may have been intended for private worship or simply home decoration and show various scenes of religious or secular life. Horses, introduced from Iran became increasingly common in Mesopotamia from the early second millennium BC onwards. Eventually they were used for pulling light chariots. The technology of chariots developed, and changed the face of warfare in the Middle East from Egypt to the Indus valley and beyond. Although this mould shows a rider, it does not show a cavalryman. All image of riders of this period ride bareback, without stirrups, and straddle the horse towards its rump, not a position from which one can control the animal easily. It was only in the ninth century BC that cavalry horses were introduced, ridden by Assyrians from the forward seat. Thus a new form of warfare, the cavalry charge, was introduced. It is possible that selective breeding played a part in these developments.