 While trying to storm O'Byrne's fortress at Glenmalure in the heart of the Wicklow mountains, they were ambushed and mauled, losing over 800 men killed.William Stanley was sent by Grey de Wilton to defend the Pale area of Leinster.For the remainder of the war, O'Byrne and his allies raided English settlements in the east and south east, but were unable to take strategic advantage of their victory at Glenmalure.