Boyne, Battle of the

Battle fought on 1 July 1690 in eastern Ireland, in which the exiled King James II was defeated by William III and fled to France. It was the decisive battle of the War of English Succession, confirming a Protestant monarch, and has become the most commemorated battle in modern Irish history. It took its name from the River Boyne which rises in County Kildare and flows 110 km/69 mi northeast to the Irish Sea.

After obtaining aid from Louis XIV of France, James landed in Ireland where he had numerous supporters. King William also landed an army in Ireland, collected more forces from Londonderry, and marched south with about 36,000 troops. James's forces had taken up a position on the south side of the River Boyne, and William launched the attack by sending a force to cross the river some miles upstream so as to turn the Irish flank. The French turned to oppose this attack, and William then sent his cavalry across the river in a frontal assault on James's position. After fierce fighting the Irish foot soldiers broke but their cavalry continued to fight for some time before being routed. James fled to Dublin while his army largely became fugitives; any hopes of James's restoration to the English throne were finally dashed.