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Framed for murder by his own half brother, Sir Oliver Tressilian (Milton Sills) is impressed into service aboard a British ship. When that ship is captured by the Spanish Armada, he is put to work as a galley slave. Escaping to a band of Barbary pirates, he eventually becomes their leader. He gains wealth and fame during his adventures as "The Sea Hawk," but he dreams of returning to England to exact revenge on his brother -- and to reclaim his fiancée. Wikipedia