In 229 BC, in light of Wang Jian's invasion of Zhao, where Li Mu had already achieved an stalemate against the Qin Generals Wang Jian, Yang Duan He and Qiang Lei; the Qin decided to sent spies to the Zhao court, bribing key courtiers such as Guo Kai (郭開) and Han Cang (韓倉) in order to convince them to persuade the King of Zhao to replace Li Mu and Sima Shang (司馬尚) with Zhao Cong (趙蔥) and Yan Ju (顏聚) as generals by alleging that the former were planning a rebellion.
In 229 BC, in response to Wang Jian's invasion of Zhao, where Li Mu had already halted the Qin Generals' advances against him, Yang Duan He, and Qiang Lei; the Qin resorted to sending agents to the Zhao court, bribing influential courtiers such as Guo Kai (郭開) and Han Cang (韓倉) in order to induce them to convince the King of Zhao to replace Li Mu and Sima Shang (司馬尚) with Zhao Cong (趙蔥) and Yan Ju (顏聚) as generals by suggesting that the former were plotting a rebellion.