 In 870, while Amlaíb and Ímar were besieging Dumbarton, Áed Findliath laid waste Leinster "from Dublin to Gowran", though it is not clear whether Dublin itself was attacked during this campaign.In the same year, a leader of the Dubgaill called Úlfr invaded eastern Ireland and killed Máel Sechnaill mac Néill, one of the two kings of South Brega .In 872, we are told by the "Fragmentary Annals of Ireland", "the kings of the foreigners" massacred the men of the Three Plains and the Three Comanns in Counties Laois, Kildare and Carlow.