This kind of situation has been constantly appearing in the history of the Northern and Southern Dynasties. At the end of the Sui Dynasty, Wei Chijiong led the Hu people into the Zhou Dynasty. At the end of the Sui Dynasty, Li Yuan led the Turks to attack Liu Wuzhou. At the time of the Southern Song Dynasty, the generals were bent on making peace with Jin Lien Chan and Lian Jie Song Gaozong. However, Yue Fei’s soldiers had pointed out that the most critical moment was to send 12 gold medals to recall him. Compared with Wu Sangui’s introduction of the Qing army, it was a pediatrician.