长平之战
Later, as the threat from Qin increased with the previous ascension of King Zheng, Li Mu turned his focus more towards the western parts of Zhao. However, the State of Zhao was significantly weakened. After having previously suffered utter defeat at the hands of Qin forces led by Bai Qi during, and in the aftermath of, the Battle of Changping in 260 BC, in which Zhao had lost virtually its entire army, most of the core Zhao territories had fallen to Qin. Furthermore, Zhao was diplomatically isolated as the Kingdoms of Wei, Yan, and Han were too weak to offer any kind of support, while Qi and Chu were more willing to see the kingdom extinguished than face the powerful Qin.