What happens in The Great Army?
Spoilers for this episode and earlier events.
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother. Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
- Season & episode
- Season 4, episode 17 of 20
- Series order
- 46 of 89
Story connections: Bjorn Ironside, Lagertha, Ivar the Boneless and Ubbe.
Identify a face in this episode.
Episode references: HISTORY season guide · Community episode record.

Key events and consequences
A shared cause can assemble a great army without resolving who has the right to punish whom. Bjorn makes that limit explicit by protecting Lagertha from his brothers. Floki's chariot equips Ivar to participate differently in war, while Rollo's settlement offer demonstrates that another future remains available beyond revenge.
- Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother.
- Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Key characters

Bjorn Ironside
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother.
Character story
Lagertha
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother.
Character story
Ivar the Boneless
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother.
Character story
Ubbe
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother.
Character story
Floki
Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Character story
Rollo
Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Character story
King Ecbert
Character story
Judith
Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Character story
Alfred
Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Character storyLocations and story geography
Kattegat
The gathering fleet turns a family loss into a collective military undertaking while leaving the family's internal dispute unresolved.
Francia
Rollo's land offer provides a settlement alternative as the great revenge expedition forms.
These are places in the story. For the real landscapes used on screen, explore the filming-location guide.
The episode breakdown
What changes in this episode
Ubbe, Sigurd and Ivar organize the army, and an outside fleet arrives to take part. Bjorn prevents his brothers from killing Lagertha, making clear that he will stand between them and his mother. Floki gives Ivar a war chariot. Rollo returns to Francia and offers land to prospective settlers. Judith fails to persuade Ælle to cooperate with Ecbert, while Ecbert continues educating Alfred for a future role.
Why it matters — original analysis
The army’s scale should not be mistaken for a single intention shared by everyone inside it. Bjorn’s defense of his mother establishes a limit before the force has even crossed the sea. Cooperation therefore begins with an unresolved conflict, not with that conflict temporarily ceasing to matter. The chariot supplies a different kind of practical answer: Floki changes the material conditions through which Ivar can participate in command. Across the sea, the argument over alliance reveals that preparing for a threat depends first on accepting how large it may be.
Rewatch focus — original analysis
Compare the tangible preparation of ships and equipment with the emotional and diplomatic preparation around them. A family can agree on an enemy and still disagree about whom it must protect. The episode gives those differences room before battle makes the collective appear more unified than it is.
Themes to follow
- coalition and family division
- mobility and command
- misreading a threat