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In the 31st year of Hongwu in the Ming Dynasty, the founding emperor Zhu Yuanzhang passed away. At that time, Prince Zhu Biao died of illness, and the second prince, King Qin, and the third prince, King Jin, both died in the struggle for the throne. Zhu Biao's son and grandson Zhu Yun succeeded to the throne. He was called Emperor Hui and changed to Jianwen of Yuan Dynasty. Known as Emperor Jianwen in history. There are rumors in the court and among the people: Zhu Di, the fourth prince of Yan, who believes that his father's throne should be "passed on to his sons rather than his grandsons", is secretly preparing to raise troops to go south. In the name of eliminating traitors, he seizes the throne. And the current emperor, Emperor Minghui, had long been wary of King Yan. Not only did they control the Changlu Saltworks, but they also strictly ordered the salt administration in Hedong, Shanxi: No grain or salt could be supplied to the nine sides of the Great Wall. He must want to draw fuel from the bottom of the Yan King's cauldron and subjugate his troops without fighting. At the same time, an edict was issued to deprive the King of Yan of his military power, and ordered the crown prince of Yan, Zhu Gaochi, to go to Nanjing to pay homage to Taizu's mausoleum.