Battle of Mt. Dingjun

The Battle of Mt. Ding Jun was a battle between the forces of Liu Bei and Cao Cao. Liu Bei was seeking to control the culturally vital Hanzhong region, as well as open a path into Wei, while Cao Cao was trying to stop him. The two archers Huang Zhong and Xiahou Yuan developed a rivallry here, ending with Huang Zhong slaying Xiahou Yuan, and driving out Wei.

Aftermath
After Hanzhong was secured, Liu Bei, under pressure from Zhuge Liang, declared himself King of Hanzhong, prompting Guan Yu to launch a secondary offensive on Fan Castle, which started a chain of events that lead to Shu's crippling defeat at Yi Ling