It was one of the most epic episodes in Game of Thrones history with some calling it the best battle scene ever seen on TV.
The Long Night, the third episode in the eighth and final season of the hit HBO show , was actually filmed across nearly three months in Northern Ireland.
The Belfast crew were involved in 11 weeks of night shoots, 55 straight nights out filming in a cold field.
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HBO has released a 40 minute video detailing exactly how the Battle of Winterfell was filmed and the work that went into it.
In the footage, D. B Weiss, executive producer and writer, said: "Working in pitch dark and rain and mud, it's a real testament to the entire Belfast crew who gave us something that no amount of money could ever buy."
The episode was directed by Miguel Sapochnik who said he "never wanted to do that again".
They filmed from 6pm in the evening until 5am in the morning in freezing conditions.
Jacob Anderson, who plays Grey Worm, said after a few weeks everyone started to "look haunted", with others describing the experience as "horrible".
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Take a look at the video to discover just how much blood and sweat went into the iconic TV moment right here in Northern Ireland.
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