The Raid of Hexham was featured in Season 1 Episode 4 . Athelstan told Ragnar about a small town near Lindisfarne, called Hexham, and he decided to go there and raid it. He asks permission to Earl Haraldson, but the earl imposes a condition: Knut, a man the earl can trust and also his half-brother, must go with the warband. This time, Lagertha also participated in the raid. The rest of the warband was the same in Lindisfarne.
When the group arrives in Northumbria, they are met by a small army on the beach (episode 3). The Sheriff asks if they are traders, and Ragnar tries to talk and negotiate with them, but Rollo didn't trust the Northumbrians and says they are leading them into a trap or ambush. Floki then steals a neckless of the cross from one of the soldiers, starting a fight between the vikings and the english warriors.
Ragnar's warband defeated the saxons and captured one of their soldiers as prisioner, but one of them escaped on a horse who informs King Aelle of the foreigners. The prisoner led the vikings to Hexham, a small town in Northumbria. Rollo was impatient and urged to attack, but Ragnar said they would attack tomorrow because it was Sunday and they could attack them during mass.
The morning the raiders attacked the town while most of its populace was attenting mass. They managed to sneak in and attacked the church by surprise. Ragnar told the priest to not resist. The vikings then pillaged everything in the church, and Floki killed the priest. Rollo broke into a house and saw and old man lying on the bed, who was naturally afraid of Rollo. Instead of killing the old man, Rollo gave him water, and then took the kettle. Knut entered a house and saw a woman protecting her son. He started to rape her, but was stopped by Lagertha. Knut then tried to rape Lagertha, but she killed him in self-defense.
Later, the group ran away back to their boat, and Ragnar asked about Knut. Lagertha answered that she killed him, because he raped a saxon and then tried to rape her.
Ragnar and his warband return to Kattegat with the riches they plundered from Hexham. Haraldson questions the whearabouts of his friend Knut , to which Ragnar states he killed him for trying to rape Ragnar's wife Lagertha . Haraldson doesn't believe Ragnar and finds it too convinient. Ragnar is then arrested and put on trial. Ragnar appeals to the people of the court. Lagertha soon after states that it was her that killed Knut. Rollo is ordered to step forward to confirm the truth to which he states that Ragnar killed him but not in cold blood, so he cannot be punished.
After Ragnar's release Haraldson orders assassins to attack Ragnar's warband while they celebrate their successful raid and Ragnar's freedom. The assassins kill Erik, Leif's father. The following day an attack is organised on Ragnar's farm where many are slaughtered and Ragnar is gravely wounded.