The Lord of the Rings: Rohan no Tatakai Episode 1

183 years before the events chronicled in the original trilogy, a sudden attack by Wulf, a clever and ruthless Dunlending lord seeking vengeance for the death of his father, forces Helm Hammerhand and his people to make a daring last stand in the ancient stronghold of the Hornburg. Finding herself in an increasingly desperate situation, Hèra, the daughter of Helm, must summon the will to lead the resistance against a deadly enemy intent on their total destruction.

(Source: Warner Bros.)