Battle of Changping
In the 55th year of King Nan of Zhou (262 BC), Qin sent Bai Qi to invade Han and took Yewang. To broker peace, King Huanhui ceded Shangdang Commandery to Qin. The people of Shangdang refused to be ruled by Qin but also lacked the military strength for defense. Shangdang's "governor-general" Feng Ting (冯亭) surrendered instead to Zhao. Zhao accepted the surrender and sent Lian Po to defend Changping; the Battle of Changping ensued.