Some of the most striking clips from the trailer revolve around a battle which could prove to be the biggest in the show's history. It all appears to be part of the same skirmish too, with the Boltons and wildlings squaring off head-to-head in a battle for Winterfell(?) though they're not the only expected combatants. The action is so fast-paced, it's tough to decipher exactly what's going on, but there are suggestions that Jon Snow himself could lead the North into battle alongside the wildlings. Whether that happens or not isn't confirmed, but it would be spectacular to watch, and would constitute a phenomenal Episode 9, if that's the plan.