Genghis Khan assembled a large Mongol army to conquer lands across Russia, the Middle East and China in the 13th century. The Mongol soldiers were skilled horsemen and warriors, well-trained in tactics like mounted archery. They used cavalry and archers effectively in battle, surrounding enemies on horseback and picking them off from a distance with bows and arrows. Through their loyalty, discipline and mobility provided by their horses, the Mongol armies were able to achieve major conquests and expand Genghis Khan's territory and power across Eurasia.