Jing Ke
In 228 BC, after the fall of Zhao, Wang Jian led the Qin army stationed at Zhongshan (; around present-day central Hebei) to prepare for an offensive on Yan. Ju Wu (), a Yan minister, proposed to King Xi of Yan to form alliances with Dai, Qi and Chu, and make peace with the Xiongnu in the north, in order to counter the Qin invasion. However, Crown Prince Dan felt that the alliance strategy was unlikely to succeed, so he sent an assassin, Jing Ke, to assassinate Ying Zheng, the King of Qin. Jing Ke pretended to be an envoy from Yan to Qin and brought along with him a map of Dukang and the head of Fan Wuji, a Qin turncoat general. Jing Ke failed and died in his attempt to kill Ying Zheng.