معركة ممر شانهاي, fought on May 27, 1644 at ممر شانهاي at the eastern end of the Great Wall, was a decisive battle leading to the beginning of the Qing dynasty rule in China proper.There, the 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 Qing army to rapidly conquer ...