: In England, King Ecbert makes a strategic pact with Prince Wigstan of Mercia. Wigstan offers to hand over the crown of Mercia to Ecbert, potentially making him king of both Wessex and Mercia.

: Ragnar’s plan to attack by sea and land simultaneously goes horribly wrong. Rollo’s defensive chain traps the Viking ships, while fire and crossbow fire decimate the fleet. Ragnar is forced to retreat, even as he saves Floki from drowning.

The seventh episode of Season 4, titled " The Profit and the Loss " ("El beneficio y la pérdida"), originally aired on March 31, 2016. This episode centers on the massive initial failure of the Viking fleet against the fortified defenses of Paris, orchestrated by Ragnar’s brother, Rollo. Key Plot Points

: After the defeat, Ragnar's mental state worsens. He begins talking to a severed head and grows increasingly dependent on the "medicine" provided by Yidu. Main Cast "Vikings" The Profit and the Loss (TV Episode 2016) - IMDb