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In page Battle of Yamen:

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Zhang Shijie, having escaped the battle, hoped to have Dowager Yang appoint the next Song emperor, and from there continue to resist the Yuan dynasty. However, after hearing of Emperor Huaizong's death, Dowager Yang also committed suicide at sea. Zhang Shijie buried her at the shore. He and his remaining soldiers were assumed to have drowned at sea, as a tropical storm whipped up soon afterwards. However, there have been suggestions that his death was simply Mongolian propaganda, since no remains or trace of his fleet were ever found.[citation needed]