The Libyans, Carthaginian citizens and the Libyo-Phoenicians provided disciplined, well trained cavalry equipped with thrusting spears and aspis shields that were later replaced by a flat oval shield called the thyreos. Numidia provided superb light cavalry, highly skilled in skirmishing tactics, armed with bundles of javelins, a small round shield and riding without bridle or saddle. Iberians and Gauls also provided cavalry that relied on the all out charge. The Libyans provided the bulk of the heavy, four horse war chariots for Carthage, used before the Second Punic War. Allied cities of the Punic hegemony also contributed contingents for the army. The Carthaginian officer corps held overall command of the army, although many units may have fought under their chieftains.