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.