Among the Twelve Deceptive Stratagems recorded in The Art of War · Initial Estimations, Sun Tzu put forward a lethal psychological warfare tactic: Divide the united enemy (親而離之).
This article tells the tragic end of the Ming Dynasty. The Qing rose in the northeast, while Li Zicheng’s rebel army marched on Beijing. Chongzhen Emperor hanged himself at Meishan. Li briefly ruled Beijing but lost support. Wu Sangui allied with the Qing, who defeated Li and seized the capital, founding the Qing Dynasty.
This article records the Suzhou Uprising against Wei Zhongxian’s tyranny. Locals revolted to protect upright official Zhou Shunchang from arrest by the Eastern Depot. Five citizens surrendered to save the city and were martyred. Later, the Chongzhen Emperor toppled Wei, and the five were honored as symbols of justice.