Sword-storm off Rauðabjǫrg?

Rauðabjǫrg is the location of the great sea battle between Earl Þorfinnr and Earl Rǫgnvaldr in the Saga of the Earls of Orkney in which we hear that: ‘Earl Rǫgnvaldr gathered his army in the Orkneys and intended to go over to Ness, and when he arrived at the Pentland Firth then he had thirty …