In 190, Dong Zhuo intruded into the Han capital and roofied a few officials and two emperors so he could easily swipe the throne, as the new emperor became a figurehead. One warlord, Cao Cao, believed that the Dong had screwed him over and tried to assassinate him when he was vulnerable and open for easy penetration. However, this one guy named Lu Bu was able to thwart the assassination attempt, sending Cow Cow fleeing.