• 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 18 goes on air on Jan. 18. The upcoming segment is titled "Revenge" and it features the highly-anticipated battle to avenge Ragnar's death. Here are a few spoilers and promos for the much-awaited segment. Read on to find out what happens when the Great Heathen Army and King Alle meet on the battlefield. Also, find out where to watch episode 4X18 online via live stream. Scroll down for the link.

Like Us on Facebook

[Spoiler alert! This article contains spoilers for "Vikings" Season 4 episode 18 "Revenge." Do not read further if you don't wish to know more about it.]

Fans must brace themselves for an epic battle between the two enemies. The network has released a brief synopsis teasing what to expect from the eighteenth chapter of the season. According to the "Vikings" Season 4 episode 18 "Revenge" description, as published on Spoiler TV, Ragnar's plan finally becomes reality. The Great Heathen Army, also known as the Great Viking Army, is ready with its battle plan and lands on the coast of Northumbria to not only avenge the death of their father but also conquer Northern England.

The network has released promo videos teasing what to expect from "Vikings" Season 4 episode 18 and giving a glimpse at the great battle between the Vikings and Anglo-Saxon Kingdoms of England. The first promo showcases the scenes from the battleground and gives a glimpse at Vikings' Great Army moving towards their enemy for attack. King Alle looks worried when he realises the size of Vikings army is greater than what he thought.

The second promo for "Vikings" Season 4 episode 18 teases tension between the brothers. It suggests the struggle for the power between Bjorn and Ivar the Boneless.

"I will establish the battle plan and I will give the orders. I am the leader of this great army," Bjorn announces to his brother. However, it seems Ivar may have a different plan. Scroll down to watch the promo videos online.

"Vikings" Season 4 episode 18 "Revenge" airs Jan. 18 at 9:00 pm on History channel. Fans can also watch episode 4X18 online via live stream on history.com. Stay tuned for more spoilers and updates.