 The population of Dublin during the so-called "longphort phase" is estimated to have been quite considerable, amounting perhaps to several thousands.According to the annals, the Vikings of Dublin lost as many as 900 warriors at Carn Brammit in 847 without being overrun.It is assumed that streams of new immigrants from Britain and Scandinavia sustained the early settlement in the face of almost continuous hostility on the part of the native Irish.