山海关
When the capital fell to Li Zicheng's armies on 24 April, Chen nearly died but was saved by his family. He then served in Li's administration for a few weeks until Li was crushed in the Battle of Shanhai Pass in early June by the allied troops of the Manchu Dorgon, Prince Regent of the Qing dynasty, and Wu Sangui, a Ming general who let the Qing army enter the North China plain through Shanhai Pass. Dorgon entered Beijing victorious on 5 June 1644.