In 236 BC, Wang Jian commanded the Qin army which attacked Zhao and captured nine cities. This action represented the start of King of Qin, Ying Zheng's wars of unification.[2] The Kingdom of Zhao ceased to exist in 228 BC after Wang Jian used spies in the Zhao court to have Zhao's leading general Li Mu replaced and then he captured Zhao's king.[3]