 Complete the following phrase:  Xu served as Commander of the Nanjing Military Region 195474, first under East China Military and Administrative Committee chairman Rao Shushi, and then for ten years with Gang of Four member Zhang Chunqiao as his political commissar 196776. This assignment was the single longest tenure of any Military Region commander on record. Among his deputies during the 1960s were future regional leaders Sung Shilun, Wang Bicheng and Tan Qilong, As the armed forces were called in to restore administrative control, he became Chairman of the Jiangsu Province Revolutionary Committee 196874 and CCP First Secretary 197074. In the long-delayed military region reshuffle initiated under Deng Xiaoping, Xu was rotated to command the Guangzhou MR 197480. Xu and political commissar Wei Guoqing provided protection for Deng Xiaoping in 1976, when the future paramount leader was purged by the Gang of Four following the death of Zhou Enlai. Xu was also commander in chief for the Chinese forces in the 