Mao Sui 毛遂 was a retainer of Lord Pingyuan 平原君 of Zhao 趙. Mao Sui was sent to the state of Chu 楚 to ask for support against the army of Qin 秦 that besieged the capital of Zhao, Handan 邯鄲. Mao Sui succeeded to pursade the king of Chu to make a blood alliance with Zhao. This story is recorded in the Shiji 史記, not in the Zhanguoce 戰國策.