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Was it the Wu people or the Vietnamese who crossed the border to Japan?

It was Wu who crossed the sea to Japan. In 473 BC, the King of Yue Gou Jian destroyed Wu. Many nobles, soldiers and people of Wu had to wander around in order to escape Gou Jian's revenge. I had to wander in the East China Sea and the Yellow Sea, and finally drifted to the Korean Peninsula or Kyushu Island in Japan.