According to the Four Masters, in 1149 ""An army was led by Toirdhealbhach Ua Briain and the men of Munster into Connacht, until they arrived at Magh Ua mBriuin; they carried off a great spoil of cattle, and demolished Dún-Gaillmhe; and Ua Lochlainn, lord of Corca-Modhruadh, was drowned in the (river) Gaillimh."" Again, the mention of Magh Ua mBriuin - an alternative name for Maigh Seola - demonstrates the destruction of Gallimhe and its fleet was merely one tactic employed by O Brian. Kinsmen and vassals would only stay loyal as long as a king could deliver the goods to ensure their loyalty, hence the rich plains were plundered of their goods, food and fine cattle. It also had the additional prize of weakening O Conchobair's prime vassal in the area, Ua Flaithbheartaigh.