Method: July 12th on Gregorian calendar Length: 1 day Period: 1 year More Information Battle of the Boyne Day The Battle of the Boyne ( Irish : Cath na Bóinne , IPA:  [ˈkah n̪ˠə ˈbˠoːn̪ʲə] ) was fought in 1690 between two rival claimants of the English, Scottish, and Irish thrones –