In June of the ninth year of Wude (626), just after the Xuanwu Gate Incident, and less than a month after Li Shimin ascended the throne, Jieli Khan led 200,000 cavalry southward. At the darkest moment when his father had just killed his brother to seize the throne, the people in the court were scattered, and foreign enemies were approaching the city, he used his insights and courage beyond the times to turn the tide. He competed head-on with Li Chengqian, Li Tai and other princes for the throne, and counterattacked step by step to change his fate.
