present-day Ezhou, Hubei). Around March or April 231, the indigenous tribes living in Wuxi (五谿; literally "five streams"; referring to an area around present-day Huaihua, Hunan) rebelled against Wu rule, Sun Quan granted Pan Jun acting imperial authority and ordered him to supervise the general Lü Dai as he led 50,000 troops to pacify the rebellion. During this time, Pan Jun ensured that promises were kept, and rewards and punishments were given out fairly. By December 234, the rebellion ended with over 10,000 rebels killed or taken captive. The indigenous tribes also became so drastically weakened that they could not rebel again in a long time. At the end of the four-year-long campaign, around December 234 or January 235, Pan Jun returned to Wuchang, where he was previously stationed. When he was in Wuchang, he and the Wu general Lu Xun were in charge of civil and military affairs in Jing Province. Attempting to assassinate Lü Yi Sometime the 230s, Sun Quan appointed Lü Yi as the supervisor of the bureau in charge of auditing and reviewing the work of all officials throughout Wu. The bureau essentially functioned like a modern secret service and served as a precursor to the censorate of later Chinese dynasties. Lü Yi freely abused his powers by falsely accusing many officials of serious offences, resulting in some of them being wrongfully arrested, imprisoned and tortured. His victims included the Imperial Chancellor Gu Yong and the general Zhu Ju. Lü Yi initially wanted to make a case against Gu Yong for incompetence and ask Sun Quan to remove him from office. However, after an official Xie Gong () reminded him that Pan Jun, the Minister of Ceremonies, would most likely succeed Gu Yong as Imperial Chancellor, Lü Yi immediately dropped the case against Gu Yong. This was because he knew that Pan Jun resented him and would take action against him if he became Imperial Chancellor. Pan Jun managed to seek permission from Sun Quan to leave his post at Wuchang (武昌; present-day Ezhou, Hubei) and return to the Wu imperial capital, Jianye (present-day Nanjing, Jiangsu). Although he wanted to speak up about Lü Yi's abuses of power, he decided to take matters into his own hands after seeing that Sun Quan paid no attention to the crown prince Sun Deng, who had already voiced concerns to his father about Lü Yi on numerous occasions. He