It overlooked Athlethan, or Strade, where he built an abbey for the Franciscans but at the behest of his wife, transferred it to the Dominicans in 1253.
They burned Mac Henry's castle and captured its warden and carried the preys of North Umall onto the islands of Clew Bay.
Then Jordan D'Exeter and John Butler and Robin Laigles and many others assembled and marched first to Ballintober and thence to Aghagower, and next day they plundered Umall, north and south.
Now they were on the Clew Bay islands, and it was told them that a body of men were on their way from Mac Henry to Domnall, to fetch boats.
For this was a victory with defeat, since that valorous champion and well-tried warrior, Diarmait son of Magnus, was himself killed.
Mary wrought a miracle then; for when the princes and their followers saw the horsemen in arms and armour making towards them, horror and dread seized them and they were put to flight.
They sailed round the west of Ireland into Connemara and robbed a merchant ship of all her goods; wine, copper, cloth and iron.
The fleet of the Galls retired after losing the best of their lords, and Mac Somurli went back to his land, joyful and laden with spoil.