The worst English military defeat in Ireland during the entire Tudor conquest. O'Neill and O'Donnell ambushed Bagenal's army marching to relieve the Blackwater Fort. The English lost c.2,000 men killed and all their artillery. Bagenal himself was killed. The victory triggered a nationwide Irish uprising and O'Neill was proclaimed "The O'Neill" — Prince of Ulster. Elizabeth I sent the Earl of Essex to Ireland with the largest army yet assembled for Ireland.
c.2,000 English killed; Bagenal killed; Irish losses light
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