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In page Battle of Yamen:

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First, the north flank engaged the Song forces but were repulsed. The Yuan then began playing festive music, leading the Song to think that the Yuan forces were having a banquet and lowering their guard. At noon Zhang Hongfan attacked from the front, hiding additional soldiers under large pieces of cloth. Once Zhang Hongfan's boats neared the Song fleet, the Yuan sounded the horn of battle, revealing the soldiers under the fabric.[citation needed]