However the following year Toirdhealbhach was decisively defeated by O Conchobair and his vassals at Feara Ceall in the Sliabh Bloom; O Brian had been en route to Meath to fight O Ruairc but had been intercepted by O Conchobair. O Brian was forced to return home, ""without prey, without hostage, without peace, without truce."" This brought O Brian and O Conchobhair into open war; O Brian struck within the same year with "an army into Connacht; and they carried off Ua Ceallaigh, i.e. Tadhg, son of Conchobhar, lord of Ui-Maine, and slew Ruaidhri Ua Flaithbheartaigh". The death of Ua Flaithbheartaigh indicates that an attempt may have been made on Gallimhe, but O Brian would have to wait a full four years before he reached this objective. 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. Ua Lochlainn was of the Corcu Mo Druad, vassals of O Brian, and strategically located across Galway Bay. Thus it is possible that while O Brian led his army by land, Ua Lochlainn sailed across the bay and the two inflicted a sea-and-land siege of Gallimhe; this possibility is obliquely hinted at in the manner of Ua Lochlainn's death.