In the first year of Jianwen (1399), Zhu Di rebelled, and then marched south, known in history as the "Battle of Jingnan". At this time, it was only about a year before Emperor Jianwen ascended the throne.
During this period, Emperor Jianwen's main job was to cut the domain, he cut five clan kings in succession, and then set his sights on Zhu Di. At the same time, in order to prevent Zhu Di from rebelling, Zhu Yunzhi sent Zhang Fu, a servant of the Ministry of Works, as an envoy to Beiping, and both commanded Xie Gui and Zhang Xin to be the commanders of Beiping. Subsequently, he ordered the governor Song Zhongtun to garrison Kaiping and transfer the army of the Northern Plains that was under the jurisdiction of the Yan King.
Zhu Di saw that the situation was not good and began to make preparations.
First of all, Zhu Di first pretended to be ill, so that Emperor Jianwen would let his third son return to Beiping. Because his subordinates were executed by the imperial court, they pretended to be crazy. However, it was later discovered by Emperor Jianwen.
Zhu Di was already dissatisfied with his father's appointment of his nephew as his grandson and his successor, so he immediately booby-trapped and killed the generals who had come to carry out the task of surveillance and arrest.
These are just one aspect. Soldiers and weapons are essential to rebel.
Therefore, Zhu Di recruited many strong soldiers, constantly trained them, and trained them to become a sophisticated army.
Of course, it is not enough to have soldiers, because if you want to go to the battlefield as a soldier, you should also need weapons in your hands, and you can't always start on the battlefield with a wooden stick in your hand.
At this time, Zhu Di remembered a very good method, after all, the sound insulation at that time was not very good, so Zhu Dai began to dig an underground basement to live in the basement to live with weapons, and then feed the chickens on top of the casting weapons, because there was a great opportunity to cover up the sound of those forged weapons, so that they could be carried out unconsciously.
In addition, Zhu Di was also very good at winning over allies, and he used clever tricks to force King Ning to side with him, and also made a promise to him, knowing that King Ning's combat effectiveness was still very strong.
But in fact, even if Zhu Di did not have these preparations, Zhu Yunjiao would have to attack him. However, it was precisely because of Zhu Di's quiet preparations that in the Battle of Jingnan, a surprise attack was given to Emperor Jianwen, and there were also forces to confront the imperial court.
In the fourth year of Jianwen, Zhu Di's soldiers attacked Nanjing and entered the imperial palace, Zhu Yunjiao disappeared in a sea of fire, whether he died or fled is still a mystery. Zhu Di naturally ascended the throne as emperor.