State Council Information Office of the People's Republic of China, History and Development of Xinjiang (2003)
“ In 121 B.C., a Han army inflicted a crushing defeat on the Xiongnu troops stationed along the Gansu Corridor. After that, the Han Dynasty set up the four prefectures of Wuwei, Zhangye, Jiuquan and Dunhuang in the region. In 101 B.C., the Western Han Dynasty stationed hundreds of garrison troops in Luntai and Quli, south of the Tianshan Mountains, and appointed a local “envoy commander” to command them. ”
