 The siege was lifted after the Zhao general Zhao She (趙奢) ambushed and decisively defeated the invading Qin army.In 265 BC, Qin struck back at Zhao and captured three cities, and King Huiwen of Zhao resorted to sending his son to the state of Qi in exchange for Qi assistance, which forced the Qin army to withdraw.In 262 BC, Bai Qi attacked and cut off the Shangdang Commandery from the Han mainland.