 The first was the administrative unit of the banners, which the Qing rulers employed to divide the Mongols and sever their traditional lines of tribal authority; no prince could expand and acquire predominant power, and each of the separate banners was directly responsible to the Qing administration.If a banner prince made trouble, the Qing government had the power to dismiss him immediately without worrying about his lineage.The second important factor in the taming of the once powerful Mongols was the "Yellow Hat" school of the Tibetan Buddhism.