The Battle of Portlester took place on 7 August 1643 near the town of Portlester, Leinster in Ireland as part of the Irish Confederate Wars. It was fought between the Ulster Army under Owen Roe O'Neill and a largely Protestant government force from Dublin under Lord Moore, with both sides proclaiming their basic loyalty to Charles I. In a largely indecisive battle the two armies exchanged artillery fire, during which the Protestant commander Lord Moore was killed. His army withdrew handing the Irish Confederates a strategic victory.