This week’s episode of Game of Thrones was certainly one of the most epic in the show’s history. As amazing as the slaughter of Hardhome was last season, the Battle of Winterfell in the Battle of the Bastards was an even bigger set piece for the series. There were more actors, horses, props and CGI than ever before in one of these battles. The result was some of the best action in the show’s history.

To examine the battle, HBO put together this 11 minute featurette on the making of the battle. Remember though, the video is dark and full of spoilers.

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