"Horse-mounted raiders have always been a part of warfare. For example, the Mongols developed raiding tactics early in their history. Armed with recurved short bows, these steppe raiders would rush in towards their foes, fire off an eerily-accurate volley of arrows from horseback, and then retreat before the enemy could respond. Using these tactics the Mongols crushed all enemies before them, from China to Eastern Europe."
Horse domestication started during the Bronze Age and bridles were invented after that. Evidence of bit wear appears on the teeth of horses excavated at the archaeology sites of the Botai culture in northern Kazakhstan, dated 3500–3000 BC(E).