Ligdan Khan
The Chahar Mongols were fought against by Dorgon in 1628 and 1635. An expedition against the Chahar Mongols in 1632 was ordered to establish a trading post at Zhangjiakou. The Qing defeated the armies of the Mongol Khan Ligdan Khan, who was allied to the Ming, bringing an end to his rule over the Northern Yuan. The defeat of Ligdan Khan in 1634, in addition to winning the allegiance of the Southern Mongol hordes, brought a vast supply of horses to the Qing, while denying the same supply to the Ming. The Qing also captured the Great Seal of the Mongol Khans, giving them the opportunity to portray themselves as heirs of the Yuan dynasty as well.