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简介：——After relieving the danger outside the Great Wall of Zhangjiakou, regaining the Hetao, and making good relations with the Tumut Mongols, the Ming Dynasty’s dilemma of having no soldiers and horses, which was in short supply, is gone forever. Every year, goods are exchanged for goods, which can be obtained from various Mongolian ministries. A large number of good horses were obtained in exchange, so the cavalry of each department was relatively sufficient.