Li Yan, a modern military industry expert, accidentally traveled to the 20th year of Kangxi's reign in the Qing Dynasty (1681) due to an accident in his laboratory. At that time, the San Francisco Rebellion had just been put down, the Qing government was preparing to regain Taiwan, Tsarist Russia in the north coveted Heilongjiang, and the Junggar tribe in the northwest was ready to move. Li Yan relied on modern military industry knowledge and historical predictions to form the "Han Army" in troubled times, and used technological crushing and strategic layout to subvert the Manchu rule.
