The Battle of Mount Li (Li Shan) was a decisive clash that occurred in Ancient China in 771 BC near the twin cities of Haojing and Fengjing, often referred to together as Fenghao. The battle was fought between the dynastic army of King You of Zhou and the combined armies of the rebel states of Shen and Zeng and the vicious Quanrong barbarians. The outcome was a crushing victory for the insurgents that led to the dynasty's weakening and fragmentation.