 Wogan had originally been a Covenanting soldier who served under Cromwell but later defected to the Royalist cause of King Charles II.Wogan is famed for successfully defending a fort at Duncannon during the Irish Confederate Wars, from a siege by Oliver Cromwell.Thomas Roche informed the Duke of Ormonde that there was no way that he could hold the fort against Cromwell and that he would have to surrender as there were no provisions coming into the fort.