Li Xin (Qin)

Li Xin (李信) was a general of Qin during the Warring States era. Li Xin is primarily known for his role in assisting Qin Shi Huang in his conquest of the six Warring States. Aside from his career in the Warring States campaigns, he is also a fifth generation ancestor of the Han dynasty "Flying General" Li Guang.

After the fall of Zhao in 228 BC, Wang Jian's army stationed in Zhongshan started preparations for an offensive war against Yan. Ju Wu (鞠武), a Yan minister, proposed to King Xi of Yan to form alliances with the Dai, Qi, and Chu states, and make peace with the Xiongnu in the north, as a preemptive measure in preparation for the Qin invasion (Nothing was mentioned about Li Xin but in another chapter of Shi Ji, The Biographies of Assassins, it was mentioned that Li Xin captured the castles of Tai Yuan and Yun Zhong in the dialogue between the crown prince of Yan and Jing Ke, the assassin he was sending to assassinate Ying Zheng). However, Crown Prince Dan felt that the alliance strategy was unlikely to succeed, so he sent Jing Ke to assassinate Ying Zheng, the king of Qin. Jing Ke entered Qin disguised as an envoy, bringing with him a map of Dukang and the head of Fan Wuji, a turncoat Qin general. The assassination attempt failed and Jing Ke was killed.

In 226 BC, using the assassination attempt as casus belli, Ying Zheng ordered Wang Jian to lead an assault against Yan, with Meng Wu (蒙武) as Wang's deputy. The Qin defeated the Yan army as well as Yan's reinforcements from Dai in a battle on the eastern bank of the Yi River (易水), after which they captured the Yan capital, Ji (薊; present-day Beijing). King Xi of Yan and his son, Crown Prince Dan, fled with their remaining forces to the Liaodong Peninsula. A Qin army led by Li Xin pursued the retreating Yan to the Yan River (衍水; present-day Hun River, Liaoning), where they engaged with enemy forces and destroyed the bulk of Yan's army. Later, King Xi ordered Crown Prince Dan's execution and sent his son's head to Qin as an "apology" for the assassination attempt. Qin accepted the offer and did not attack Yan for the next three years.

...
Wikipedia