Like The Twelfth, the Eleventh Night bonfires celebrate the Glorious Revolution (1688) and victory of Protestant king William of Orange over Catholic king James II in the Williamite-Jacobite War (1689–1691), which began the Protestant Ascendancy in Ireland. When King William landed at Carrickfergus in 1690, his supporters in Ulster lit bonfires to celebrate. Some of those who did not join in the celebrations were attacked by the Williamites. There is also a belief that the bonfires commemorate the lighting of fires on the hills of counties Antrim and Down to help Williamite ships navigate through Belfast Lough at night. Traditionally, both Catholics and Protestants in Ulster had lit bonfires at Midsummer, May Day ("Bealtaine") and Halloween ("Samhain"), which were non-sectarian. In the 18th century it also became a tradition for Ulster Protestants to light bonfires on 11 July to commemorate the Williamite victory, and for Catholics to light bonfires on 14 August to mark the Feast of the Assumption of Mary, although this latter custom largely died out.