The Battle of Guandu of the Three Kingdoms

Cao Cao and Yuan Shao's two armies confronted each other in Guandu for two years, Yuan Shao did not listen to Xu You's advice, Xu You abandoned Shao and surrendered to Cao, and offered Cao Cao to lead the troops to burn the grain of the black nest, break Yuan Shao, and harvest Xudu. Liu Bei took advantage of the void to attack Xudu, Cao Cao went to Runan to meet Liu Bei, and Liu Bei won the first battle, and then Cao's army turned defeat into victory. After Yuan Shao's death, Yuan Shao's son Yuan Shang surrendered to Cao Cao. The city of Jizhou was breached by Cao's army.