Battle of the Boyne: Protestant Victory Shapes Ireland

Two kings fighting for one throne met across a shallow Irish river, and the outcome shaped sectarian politics on the island for the next three centuries. The Battle of the Boyne on July 12, 1690, pitted the Protestant King William III of Orange against the deposed Catholic King James II near Drogheda, Ireland, in the decisive engagement of the Williamite War. William's victory secured the Protestant succession in England and established Protestant political supremacy in Ireland that would endure until the twentieth century. James II had been overthrown in the Glorious Revolution of 1688, when Parliament invited William of Orange and his wife Mary to take the English throne. James fled to France, where Louis XIV provided troops and ships for an attempt to reclaim his crown through Ireland, where the Catholic majority remained loyal. James landed in March 1689 and quickly controlled most of the island, but his forces failed to take the Protestant stronghold of Derry after a brutal 105-day siege. William arrived with a multinational army of roughly 36,000 men, including English, Dutch, Danish, and French Huguenot soldiers. James commanded about 25,000, mostly Irish Catholics supplemented by French regulars. The armies met along the River Boyne, where William identified a crossing point near the village of Oldbridge. On the morning of July 12, Williamite infantry forded the river under heavy fire while a flanking force crossed upstream to threaten James's left. The fighting lasted most of the day, but James's nerve broke before his army did. He fled the battlefield and sailed for France, earning the Irish nickname "Séamus an Chaca" (James the Shit). William's victory did not end the war immediately, as Jacobite resistance continued until the Treaty of Limerick in 1691, but the Boyne became the symbolic foundation of Protestant Unionist identity in Ireland. The anniversary is still marched every July 12 in Northern Ireland.