In 1636, Hou Jin changed the name of the country to Qing, and watched the border of Ming Dynasty with eager eyes. Peasant uprisings in the pass were raging, food shortages were everywhere, and the Ming Dynasty was in turmoil due to internal and external troubles. After Yuan Chonghuan, the governor of Jiliao, was unjustly killed, the border troops were disheartened and the defense line almost collapsed. Huang Taiji took the opportunity to lead the Eight Banners cavalry to bypass Shanhaiguan and approach the capital.
