Which battle kills King Théoden in J.R.R. Tolkien’s The Lord of the Rings?

The Battle of the Pelennor Fields kills King Théoden in J.R.R. Tolkien’s The Lord of the Rings.

Théoden, king of Rohan, leads his riders to Gondor’s aid during Sauron’s assault on Minas Tirith. On the Pelennor, he is thrown from his horse Snowmane after the Witch-king of Angmar attacks. Théoden suffers mortal injuries, and he dies after speaking with Éomer and Éowyn. Éowyn has secretly ridden to war under the name Dernhelm and helps defeat the Witch-king.

The battle is one of the central military confrontations in The Return of the King. Rohan’s arrival prevents Minas Tirith from falling immediately, while reinforcements led by Aragorn later turn the battle. The fighting takes place on the fields outside the city, not inside the citadel itself.

Théoden is not killed at Helm’s Deep, where he survives the earlier battle against Saruman’s forces. The Battle of the Five Armies belongs to The Hobbit, and the Battle of the Morannon occurs afterward near Mordor. These are separate events in Tolkien’s chronology.