 Under his command were 1,500 soldiers from the Irish Ulster army, mostly from the modern counties of Tyrone and Cavan.Included in O'Neill's command was a regiment commanded by Colonel Philip O'Reilly.A muster of these troops took place at Clonmel on 3 January 1650 and one of O'Reilly's companies was led by Captain Cú Connacht Mág Tighearnán.