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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.
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In the final years of the Eastern Han Dynasty, the imperial capital Chang’an fell under the control of warlords Li Jue and Guo Si, former generals of Dong Zhuo who had seized power after his assassination. By 195 AD, however, their alliance had crumbled into bitter rivalry.