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In the Scottish highlands where the MacDonald and Campbell clans are constantly feuding, the body of a MacDonald is sent to the enemy chieftain.

That night, the MacDonalds raid the Campbell grounds.  Alastair captures Enid, daughter of the Campbell chieftain and, when a truce is declared, she decides to remain with her new husband.  The King of England attempts to end the clan warfare via peace treaties.

Meanwhile, Ian MacDonald begins to court Annie Laurie, the governor's daughter, who has a natural preference for the more refined Donald Campbell.  The MacDonalds are tricked into housing Campbell troops, and the bridge to the beacon light is destroyed.  Annie gives her aid in lighting the beacon, thus siding with Ian and the MacDonalds, who take revenge on their enemies.