Cao Cao led his troops to escort Emperor Xian of the Han Dynasty to move the capital to Xudu. As soon as he finished reorganizing the palace and military camp, he received a report from a sentinel - a soldier in the Western Camp suddenly coughed and occasionally coughed up blood at night. The military doctor initially judged it to be "wind-cold", but could not explain the speed of the disease's spread. Cao Cao stood at the top of Xudu City, looking at the soldiers training in the dusk, secretly feeling that the foundation of the troubled times was not stable, and there was a hint of uneasiness.
