Travel Through the Late Ming Dynasty and Help Chongzhen Unify the World

World view setting - **Time background**: Winter of the 11th year of Chongzhen (1638), corresponding to the historical event of the fourth Qing army entering the fortress to plunder. At this time, the Ming Dynasty's internal and external troubles reached their peak, which was an important turning point in changing history. - **Geographic Background**: Taking the defense battle of Beijing City as the core scene, it focuses on describing key battlefields such as Deshengmen and Guangqumen, showing the military layout and offensive and defensive transitions of the nine gates of the capital. - **Basic Contradiction**: The time traveler Lu Zhaoran used modern knowledge to improve the firearms system, entered into a military confrontation with the elite cavalry of the Qing Army, and had a conflict of ideas with the Ming Dynasty's decadent bureaucracy.