The Wusun originally lived between the Qilian Mountains and Dunhuang (Gansu) near the Yuezhi. Around 176 BC the Yuezhi were raided by the Xiongnu, who subsequently attacked the Wusun, killing their king and seizing their land. The Xiongnu adopted the surviving Wusun prince and made him one of their generals and leader of the Wusun. Around 162 BC the Yuezhi were driven into the Ili River valley in Zhetysu, Dzungaria and Tian Shan, which had formerly been inhabited by the Saka (Scythians). The Wusun then resettled in Gansu as vassals of the Xiongnu. In 133-132 BC, the Wusun drove the Yuezhi out of the Ili Valley and settled the area.