 In late 1601 Mac Suibhne's Castle was taken by the English, and then recaptured by Ó Domhnaill.In November Donnchadh submitted to Niall Garbh Ó Domhnaill, who was on the side of the English.In 1608 Donnchadh was part of the jury that indicted Ó Néill and Ruaidhí Ó Domhnaill, earl of Tírconnell, after they fled from Rathmullan in 1607.