Alfred returns from Lindisfarne, and argues that the Saxons must build a navy as the only way to stop further Viking incursions. In the new land, Floki proposes building a temple to Thor, but is opposed by Eyvind who warns that they all will starve come winter.
Meanwhile, the armies of Lagertha, Bjorn and Ubbe, and of Harald, Ivar and Hvitserk, meet above Kattegat. Lagertha proposes peace talks, but Harald, then Ivar, reject a settlement.
Before battle, Ivar takes Astrid and a third of their army towards shore, to protect their fleet. Hvitserk and his group try to flank, but are ambushed in the forest by the Sami. Battle begins, and Bjorn and Lagertha gain the upper hand, as Harald’s forces are outflanked.
Ivar hears the fighting, but says it is too late to help. Heahmund is wounded, and Harald retreats. Lagertha refuses to kill Heahmund and orders that his life be saved.