There's a betrayal as those whom Odo trusts begin to plot against him. Ecbert agrees to support Kwenthrith in Mercia.
Ragnar announces another raid on Paris at the Thing in Kattegat.
King Ecbert's ambitions are discovered as he plots to gain the crown of Mercia. The Vikings attack with some considerable force.
The defeated Vikings think about Ragnar's leadership as they move down-river.
There is a fierce battle between the Vikings and the French and it comes down to Ragnar against Rollo and the outcome seals the fates of the brothers.