Hostages were taken from Sigtrygg by Flaithbertach Ua Néill, King of Cenél nEógain and the Uí Néill, and Donnchad mac Briain of Munster in 1025 and 1026 respectively, in support of their bids for the high kingship. These hostages brought no security, and Dublin was raided in 1026 by Niall mac Eocada of the Ulaid in revenge for the naval attack of 1022. Sigtrygg formed a new alliance with the men of Brega. In 1027, Sigtrygg's son Olaf joined Donnchad of Brega in a raid on Staholmock, County Meath. Sigtrygg and Donnchad's army was defeated by the men of Meath under their king, Roen Ua Mael Sechlainn. Sigtrygg rallied to the fight again at Lickblaw (near Castlepollard, Westmeath) where Donnchad and Roen were slain.