foster son. Lü Bu was later promoted from the position of a Cavalry Commandant to a General of the Household (中郎將). He was also made a Marquis of a Chief Village (都亭侯). Service under Dong Zhuo In 190, a coalition of warlords led by Yuan Shao initiated a punitive campaign against Dong Zhuo in response to Dong's tyranny and monopoly of the central government. Dong Zhuo had deposed Emperor Ling's successor, Emperor Shao, earlier that year and replaced him with Emperor Xian, who was actually a puppet ruler under his control. Lü Bu defended Dong Zhuo and fought in battles against the coalition. In one battle at Yangren (陽人; believed to be near present-day Wenquan, Ruzhou, Henan), Dong Zhuo ordered Lü Bu and Hu Zhen to attack Sun Jian (one of the coalition members), but Lü Bu and Hu Zhen could not get along with each other, resulting in disorder in their army. Sun Jian used the opportunity to attack them and forced them to retreat. Within months, the coalition forces had reached the capital Luoyang. Dong Zhuo personally led an army to engage the coalition vanguard, led by Sun Jian, in the area where the tombs of the Han emperors were located, but was defeated and forced to retreat. Sun Jian then passed through Luoyang's Xuanyang Gate (宣陽城門), where he attacked Lü Bu and drove him back. Dong Zhuo was alarmed, so he decided to evacuate Luoyang and move the capital to Chang'an in the west. He sent his troops to pillage Luoyang and force its residents to move to Chang'an as well, and then had Luoyang destroyed by fire. The coalition did not pursue Dong Zhuo to Chang'an and eventually dissolved by itself in the following year. As Dong Zhuo usually behaved rudely in front of other people, he was afraid of being assassinated, hence he often kept Lü Bu by his side as a bodyguard. Dong Zhuo also had a bad temper and was easily agitated. During his outbursts, he threw short jis at Lü Bu, but Lü Bu reacted fast and dodged the weapons. Dong Zhuo's anger subsided after that. Lü Bu was very unhappy and he bore a grudge against his foster father. At the same time, Lü Bu was tasked with guarding Dong Zhuo's central living quarters, and he had a secret affair with one of Dong's maids. He feared that Dong Zhuo would