 In 220, Sun Quan ordered Lü Dai to replace Bu Zhi as the Inspector of Jiao Province.Bu Zhi then led over 10,000 volunteer troops from Jiao Province to Changsha Commandery (長沙郡; around present-day Changsha, Hunan).About a year later, Liu Bei, the emperor of the state of Shu Han, launched a military campaign to attack Sun Quan in retaliation against Sun Quan's seizing of his territories in Jing Province in late 219.