trusted, this was a step likely to throw all Ulster into the arms of
the Bruces. But a stronger justice of Ireland then superseded Edmund
Butler. Roger Mortimer of Wigmore, the mightiest baron of the Welsh
march, and a man of real ability, rare energy, extreme ruthlessness,
and savage cruelty, crossed over from Haverfordwest early in 1317 at
the head of a large force of marcher knights and men-at-arms, versed
from their youth up in the traditions of Celtic warfare. Mortimer set
himself to work to break up the ill-assorted coalition that supported
Bruce. He released the Earl of Ulster from his Dublin prison; he
procured the banishment of the heads of the house of Lacy; he won over
some of the Irish septs to his side; he stimulated the civil war which
had devastated Connaught since the fall of the O'Connors. Edward Bruce
was once more confined to Ulster, where he still struggled on bravely.
In the autumn of 1318 he led a foray southwards, and met his fate in a
skirmish near Dundalk on October 14, when his force was scattered in
confusion by John of Bermingham, one of the neighbouring lords. The
four quarters of the luckless King of Ireland were exposed in the four
chief towns of the island as a trophy of victory, and Bermingham was
rewarded by the new earldom of Louth.

Edward Bruce's enterprise ended with his death, and Ireland rapidly
settled down into its normal condition of impotent turbulence. Though
at first sight the invader utterly failed, yet he pricked the bubble of
the English power in Ireland. His gallant attempt at winning the throne
is the critical event in a long period of Irish history. From the days
of Henry III to the days of Edward Bruce, the lordship of the English
kings in Ireland was to some extent a reality. From 1315 to the reign
of Henry VIII, the English dominion was little more than a name as
regards the greater part of Ireland.