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Around 210–200 BCE, prince Modu Chanyu, a former hostage of the Yuezhi and prince of the Xiongnu, who were also vassals of the Yuezhi, became leader of the Xiongnu and conquered the Mongolian Plain, subjugating several peoples. Around 176 BCE Modu Chanyu launched a fierce raid against the Yuezhi. Around 173 BCE, the Yuezhi subsequently attacked the Wusun, at that time a small nation, killing their king (Kunmi or Kunmo ) Nandoumi ().