is the nineteenth episode of the fourth season of the historical drama series Vikings , which first aired on January 25, 2017. The episode was written by series creator Michael Hirst and directed by Ben Bolt . Key Plot Features
: A central feature of the episode is Ivar the Boneless proving his worth as a strategist. He convinces his brothers to abandon traditional head-on tactics in favor of using the terrain to confuse and trap the English forces. [S4E19] On the Eve
The episode serves as the penultimate chapter of Season 4, setting the stage for the Great Heathen Army's major confrontation with the Saxons. is the nineteenth episode of the fourth season
: Lagertha successfully defends Kattegat against an invading army led by Egil, who was secretly funded by King Harald Finehair. He convinces his brothers to abandon traditional head-on
: The episode features notable historical inaccuracies, such as Prince Æthelwulf leading the defense against the Great Heathen Army at a time when he would have historically been dead for several years.