What is the Battle of the Boyne?? History anyone??

The Battle of the Boyne  was a battle in 1690 between the forces of the deposed King James II of England and Ireland, VII of Scotland, versus those of King William III who, with his wife Queen Mary II (his cousin and James's daughter), had acceded to the Crowns of England and Scotland[b] in 1689. The battle took place across the River Boyne close to the town of Drogheda in the Kingdom of Ireland, modern-day Republic of Ireland, and resulted in a victory for William. This turned the tide in James's failed attempt to regain the British crown and ultimately aided in ensuring the continued Protestant ascendancy in Ireland.

Explanation:

PLZ MARK BRAINLIEST

what are the reasons