Definition of the Battle of the Boyne from the Oxford Advanced Learner's Dictionary

 

the Battle of the Boyne

 
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a victory in Ireland in 1690 for the English king William III over the Jacobite armies of the former King James II. About 35 000 Protestants under William defeated about 25 000 Irish and French Catholics near the Boyne river. The event is celebrated by Protestants in Northern Ireland on 12 July every year.