General Pang Nuan of Zhao occupied several towns of the state of Yan in 236 BCE, whereupon Yan asked the state of Qin for help. Huan Yi, Yang Duan, and Wang Jian commanded the relief campaign against Zhao and took its towns Ye (today's Linzhang, Hebei) and Anyang (Hebei), as well as Eyu (Heshun, Shanxi), and Liaoyang (Zuoquan, Shanxi).