It was somewhat overlooked in its time due the naval Battle of Beachy Head, which occurred at the same time. A large amount of troops here were separated from each other by a deep ravine near Roughgrange, a landform that neither side knew existed. That mistake cost the losing side its cannons. The actual fighting broke out at Oldbridge, where George Walker and the second-in-command of the winning 
It was somewhat overlooked in its time due the naval Battle of Beachy Head, which occurred at the same time. A large amount of troops here were separated from each other by a deep ravine near Roughgrange, a landform that neither side knew existed. That mistake cost the losing side its cannons. The actual fighting broke out at Oldbridge, where George Walker and the second-in-command of the winning side, the Duke of Shomberg, were killed. The Dutch Blue Guard managed to force its way across this battle's namesake feature. The winning side had the help of infantry from the region of Ulster known as Inniskillingers, while much of the losing army in this battle had been raised by Richard Talbot, First Earl of Tyrconnel in an attempt to reclaim the landholdings lost by Catholics in Ireland during the event which this battle prevented from being reversed, the Glorious Revolution. For 10 points, name this 1690 battle that took place in Ireland, in which William III of England crushed the former James II near the namesake river.
It was somewhat overlooked in its time due the naval Battle of Beachy Head, which occurred at the same time.
Battle of the Boyne