However , he soon fled before the combined armies of former Ming general Wu Sangui and Manchu forces , setting fire to parts of the Forbidden City in the process .
Li Zicheng proclaimed himself emperor of the Shun Dynasty at the Hall of Military Eminence .
Li Zicheng soon fled before the combined armies of former Ming general Wu Sangui and Manchu forces , setting fire to parts of the Forbidden City in the process .
Li Zicheng proclaimed himself emperor of the Shun Dynasty at the Hall of Military Eminence .