The Lord of the Rings: The War of the Rohirrim centers on a character from the book’s appendix, the powerful King of Rohan: Helm Hammerhand. The animated film chronicles a legendary battle that helped shape Middle-earth. The film expands on the untold story behind Helm’s Deep Fortress, delving into the life and bloody times of Hammerhand. The story is set approximately 250 years before the events of The Lord of the Rings: The Fellowship of the Ring.