In 234 BC, Huan Yi attacked Pingyang (Linfen, Shanxi) and Wucheng (Cixian, Hebei), killed general Hu Zhe and massacred 100,000 troops of Zhao. He then left Shangdang, passed the Taihang Ridge and invaded Zhao by taking Chili and Yi'an (Gaocheng, Hebei). Zhao thereupon laid the supreme command in the hands of Li Mu, who defeated Huan Yi in the battle of Fei (Jinxian, Hebei).