supervise military operations in Yong and Liang provinces in western China. He also elevated Cao Zhen from the status of a village marquis to a district marquis under the title "Marquis of Dong District" (東鄉侯). During Cao Zhen's tenure, when one Zhang Jin (張進) started a rebellion in Jiuquan Commandery, Cao Zhen ordered his subordinate Fei Yao to lead troops to quell the rebellion. Fei Yao succeeded in his mission and killed Zhang Jin. In late 220, Cao Pi usurped the throne from Emperor Xian, ended the Eastern Han dynasty, and established the state of Cao Wei with himself as the new emperor. Two years later, Cao Pi summoned Cao Zhen to the Wei imperial capital, Luoyang, where he reassigned Cao Zhen to be Senior General of the Upper Army (上軍大將軍), awarded him a ceremonial axe, and put him in charge of supervising military affairs throughout Wei. Battle of Jiangling In 223, Cao Pi ordered Cao Zhen, Xiahou Shang, Zhang He and others to lead Wei forces to attack Wei's rival state, Eastern Wu, while he personally stationed at Wan (宛; in present-day Nanyang, Henan) to provide backup. The Wei forces attacked and besieged Jiangling (江陵; present-day Jiangling County, Hubei), which was defended by the Wu general Zhu Ran and some 5,000 soldiers. The Wei forces managed to defeat Wu reinforcements led by Sun Sheng (孫盛), Pan Zhang and Yang Can (楊粲), who were trying to help Zhu Ran. During the siege, Cao Zhen ordered his troops to dig tunnels, pile up earth to form small mounds, and build watchtowers to rain arrows on the defenders in Jiangling. Zhu Ran and his men managed to hold their ground and even found a small opportunity to counterattack and destroy two Wei camps. After some six months of siege, the Wei forces could not breach Jiangling's walls so they retreated. During the campaign, Cao Zhen and Xiahou Shang managed to destroy a Wu garrison at Niuzhu (牛渚; northwest of present-day Dangtu County, Anhui). After he returned from the campaign, Cao Zhen was reassigned to be Senior General of the Central Army (中軍大將軍) and given an additional appointment as an Official Who Concurrently Serves in the Palace (給事中). Incident with Wu Zhi In 224, Cao Pi ordered Wu Zhi to host a banquet in his residence to celebrate Cao Zhen's return from a campaign. In Cao Pi's imperial edict, all officers holding the