• SAN DIEGO, CA - JULY 10: Actor Travis Fimmel (L) and actress Katheryn Winnick attend a panel for the History series 'Vikings' during Comic-Con International 2015 at the San Diego Convention Center on July 10, 2015 in San Diego, California.

SAN DIEGO, CA - JULY 10: Actor Travis Fimmel (L) and actress Katheryn Winnick attend a panel for the History series 'Vikings' during Comic-Con International 2015 at the San Diego Convention Center on July 10, 2015 in San Diego, California. (Photo : Photo by Ethan Miller/Getty Images for A&E Networks)

"Vikings" Season 4 episode 19 airs Jan. 25. The upcoming segment happens to be the penultimate and it is titled "On The Eve." The Great Army continues the battle with Anglo-Saxon kingdoms. After successfully defeating King Aella's army, the Vikings will move forward with their plan to revenge Ragnar's death and conquer Northern England. Here are a few spoilers for the next chapter of the series. Read on to find out what happens next. Also, find out where to watch episode 4X19 online via live stream.

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[Spoiler alert! This article contains spoilers for "Vikings" Season 4 episode 19 "On The Eve." Do not read further if you don't wish to know more about it.]

"Vikings" Season 4 episode 19 "On The Eve" will see the Great Heathen Army moving forward, towards Wessex to battle against King Ecbert. According to Spoiler TV's description for the penultimate segment, the English countryside is terrified of the Viking army after its success over King Aella's army. Meanwhile, King Ecbert and his son Athelwulf plan their defense. Will they be able to protect their realm from The Great Army?

A promo video for "Vikings" Season 4 teases the events of episode 19. It gives a glimpse of a surprise attack on Kattegat. While the great army is away fighting the enemies, Kattegat is attacked by King Harald and Egil's army.

The promo shows Lagertha in the battle-field as King Harald's army destroys Kattegat. Will Lagertha and the remaining Viking army be able to defend their realm and protect what's left of Kattegat. Scroll down to watch the promo online.

Fans must brace themselves as the upcoming segment will see death of at least one of the important characters. In an interview with Entertainment Weekly, "Vikings" showrunner Michael Hearst talked about death and what to expect from the finale episode.

"It's full of surprises. And death. Death comes to important people," Hirst said.

Danger lurks at every corner for Lagertha. Will she be the one to bite the dust?

"Vikings" Season 4 episode 19 airs Jan. 25 at 9:00 pm on History. Fans can also watch penultimate segment "On The Eve" online via live stream after its television broadcast on history.com. Stay tuned, spoiler for the finale are expected soon.