In the summer of 194 AD, while Cao Cao was deep in Xuzhou, devastating Tao Qian’s forces and advancing toward Tan County, disaster struck at home. News reached him: Chen Gong and Zhang Miao had rebelled, opening the gates of Yanzhou to Lü Bu, the famed warrior fleeing from Dong Zhuo’s downfall.
In the summer of 194 AD, Cao Cao assembled a massive army to launch his second invasion of Xu Province, this time under the banner of filial vengeance. His father, Cao Song, had been murdered by soldiers of Tao Qian.