Hong Chengchou
Wu Sangui's departure from the stronghold of Ningyuan had left all territory outside the Great Wall under Qing control. Dorgon's Chinese advisors Hong Chengchou and Fan Wencheng (范文程) urged the Manchu prince to seize the opportunity of the fall of Beijing to claim the Mandate of Heaven for the Qing dynasty. Therefore, when Dorgon received Wu's letter, he was already leading an expedition to attack northern China and had no intention to restore the Ming. Dorgon asked Wu to work for the Qing instead; Wu had little choice but to accept.