Cao Cao uses his new power to attack Xu Province Following Zhuo Dong’s death, Cao Cao takes control of Yan Province and consolidates his power by enlisting the services of several accomplished military commanders and strategists. He leads an armed campaign against the remains of the Yellow Scarves; when Cao Cao emerges victorious, the remaining Yellow Scarves join forces with him. As a result, Cao Cao’s army grows to more than 300,000 soldiers, making him one of the two most powerful men in China along with Shao Yuan. Cao Cao uses his new power to attack Xu Province, where his father was killed years earlier. Years before, Qian Tao, the governor of Xu Province, received Cao Cao’s father, Song Cao, as he was passing through the province and sent Kai Zhang, one of his commanders, to protect Cao on his journey. But Kai Zhang killed Song Cao and stole his wealth. Upon hearing the news, Cao Cao swore to avenge his father and set out for Xu Province with an enormous army. -- from Three Kingdoms Vol. 3 by Wei Dong Chen & Xiao Long Liang