산해관
The Battle of Shanhai Pass, fought on May 27, 1644 at Shanhai Pass (Shanhaiguan, 山海關) at the eastern end of the Great Wall of China, was a decisive battle leading to the beginning of the Qing dynasty rule in China proper. There, Qing Prince-Regent Dorgon allied with former Ming general Wu Sangui to defeat rebel leader Li Zicheng of the Shun dynasty, allowing Dorgon and the Manchus to rapidly conquer Beijing and replace the Ming dynasty.