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  === Filming ===
  The episode was directed by Miguel Sapochnik. It was filmed in 55 night shoots over 11 weeks, and during harsh weather, at sets in Moneyglass, Saintfield and Belfast, Northern Ireland. Cinematographer Fabian Wagner described the shoot as "physically exhausting... they say don't work with animals or kids. We had everything times 100." Sapochnik studied the siege of Helm's Deep in ''The Lord of the Rings: The Two Towers'' to stage the battle scenes in a way "to not have an audience feel battle fatigue", claiming that "the less fighting you can have in a sequence, the better". He also shifted the moods from scene to scene to convey suspense, horror, action, and drama. He described the battle as "survival horror" comparable to ''Assault on Precinct 13'' in its focus on a group besieged by outsiders.