After gathering volunteers, Ragnar, Rollo, and Floki embark on an unauthorized raid to the west. Lagertha violently objects to Ragnar's refusal to take her along. Earl Haraldson has the man who attempts to seduce his wife, Siggy, killed, as well as the blacksmith who forged Ragnar's anchor. At sea the crew are caught in a storm, which a manic Floki interprets as Thor proving his ship unsinkable. On land, monks see the ominous sign of a cloud shaped like a dragon. After a tense voyage, Ragnar's men land on the coast of England, near the monastery of Lindisfarne, which they proceed to sack. They kill most of the monks and capture the rest to take back as slaves, including the young Athelstan, whom Ragnar protects from death at Rollo's hands.