Zhang Ke, a professor of Ming history, was concentrating on studying the details of Li Zicheng's arrival in Beijing. A car accident involved him in the turmoil of the late Ming Dynasty and possessed Li Zicheng. At that time, the Dashun regime was on the verge of collapse. Wu Sangui was about to lead the Qing army into the pass. Liu Zongmin tortured officials and caused the gentry to defect. Shanhaiguan's defense was weak.
Relying on modern knowledge and historical understanding, Zhang Ke skillfully used "celestial warnings" to implement the idea of "stopping torture and plundering, pacifying the gentry, and strengthening customs defense", reorganized the Dashun army, and defeated the Qing army at Shanhaiguan with exquisite tactics. After the war, he promulgated the Land Equalization Order, reformed the imperial examination, opened up sea trade, and pushed forward various new policies. Although blocked by conservative forces, it continued to innovate through "restructuring through ancient times". Twenty years later, Dashun was prosperous. He left the "Jiashen Memorandum" to rewrite history and allow China to embark on the journey of modernization ahead of schedule.
