The lower register shows four chariots, each carrying a charioteer and a warrior (carrying either a spear or an axe) and drawn by a team of four equids. The chariots are depicted in considerable detail; each has solid wheels (spoked wheels were not invented until about 1800 BC) and carries spare spears in a container at the front. The arrangement of the equids' reins is also shown in detail, illustrating how the Sumerians harnessed them without using bits, which were only introduced a millennium later. The chariot scene evolves from left to right in a way that emphasizes motion and action through changes in the depiction of the animals' gait. The first chariot team is shown walking, the second cantering, the third galloping and the fourth rearing. Trampled enemies are shown lying under the hooves of the latter three groups, symbolizing the potency of a chariot attack.