 Four years later the "Annals of Ulster" refer also to foreigners at Áth Cliath; this may simply be a loose reference to the settlement at Duiblinn, but it is possible that the native settlement of Áth Cliath was also seized and a second "longphort" established on the Liffey – possibly at Usher's Island.These settlements were temporary wintering camps () and probably amounted to little more than pirate bases.From their new base in Dublin, the Vikings plundered many territories in Leinster and the Midlands as far as the Slieve Bloom Mountains.