The movie takes place 183 years before the original trilogy and explores the fate of the House of Helm Hammerhand, the legendary King of Rohan.
The Lord of the Rings: The War of the Rohirrim
In a surprise attack, Dunlending lord Wulf seeks revenge for his father's death by targeting Helm Hammerhand, the King of Rohan, and his people, who must make a desperate stand in the ancient stronghold of the Hornburg.