The Battle of Shanhai Pass, fought on 27 May 1644 at Shanhaiguan (山海關) at the eastern end of the Great Wall of China, was a decisive battle leading to the formation of the Qing dynasty in China. 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.