The war for Wessex will begin in “Vikings” Season 5, episode 15. A preview video of the next episode has been released online. Alfred (Ferdia Walsh-Peelo) will step up to become a warrior king, thanks to the guidance of Ubbe (Jordan Patrick Smith).

King Harald (Peter Franzén) will reach Wessex, and the war will begin in the next episode. A preview video posted on Facebook shows Alfred continuing to show weakness, while Ubbe asks him to find his courage. A weak king isn’t fit to wear the crown, and young Alfred will show his strength in battle in the next episode.

There will be some difficult choices to make in order to win. Ubbe’s strategy involves putting the Wessex soldiers in harm’s way, and Alfred is reluctant. Alfred can be seen in his armor and riding his horse into battle.

All the Vikings in Wessex, including Lagertha (Katheryn Winick) and Bjorn (Alexander Ludwig), will fight in the war. King Harald and the woman he is now interested in will also get into the action.

Bishop Heahmund (Jonathan Rhys Meyers) will be afraid in “Vikings” Season 5, episode 15. God will show him a vision of the future in his dreams, and it is a frightening future. There is blood and fire everywhere. This vision seems like it is of hell.

Wessex has already passed through a major challenge. There are people in the country who want to overthrow Alfred. A scene from the previous episode posted on Facebook shows how Aethelred (Darren Cahill) chose not to give in to his greed, and supported Alfred instead. This move appears to have saved Wessex from ruin for the moment. It remains to be seen how the coming war will impact the kingdom.

The war should shake things up on the show. A review of the previous episode by Forbes suggests that the TV series hasn’t been delivering the way it used to when Ragnar (Travis Fimmel) was still alive. The new protagonist appears to be Ivar (Alex Høgh Andersen), but the review describes the character as a bad caricature of Vikings.

The preview video doesn’t show what happens at Kattegat. It remains to be seen if the death of the Seer (John Kavanagh) will impact Ivar’s rule. Also missing in the video is Floki (Gustaf Skarsgård), who is still struggling to bring about peace in the Land of the Gods.

“Vikings” Season 5, episode 15 is titled “Hell.” It will air on Dec. 26, on the History Channel at 9 p.m. EST.