There were two 'Battles of Alcantara':
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Battle of Alcântara (1580) - Battle between
Spanish invaders, lead by the
Duke of Alva, and the
Portuguese Army, during the Portuguese dynastic crisis of the 16th century. Spain won and the crowns of both countries were personally united until
1640.
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Battle of Alcantara (1809) - An inconclusive battle during the
Napoleonic Wars (the
Peninsular War).