Éomer was third Marshal of the Riddermark, and was a strong leader of Men. However, under the poisonous advice of Gríma Wormtongue, Théoden's corrupt advisor, he was arrested and exiled. His éored hunted down the Uruk-hai that had taken the Hobbits Meriadoc Brandybuck and Peregrin Took as they camped near Fangorn forest, slaying them all. He never saw the Hobbits, as they fled during the battle. Afterwards he met Aragorn, Gimli and Legolas in the plains of Rohan, and he lent them two horses, Hasufel and Erod.
He was set free when Théoden was released from the influence of Saruman. He was with his king at the battle of the Hornburg, where he and his éored, led by Théoden and Aragorn, drove Saruman's army of Orcs and Dunlendings from the walls of the Hornburg. As they fought, Gandalf arrived with Erkenbrand, a leader of the Rohirrim driven from Helm's Deep during the Battles at the Fords of Isen, and the troops that Gandalf had gathered from the chaos of the Battle of the Fords of Isen. Dismayed at this unexpected attack from the side, Saruman's Orcs were driven into the forest of Huorns, where they were destroyed; the men of Dunland were forced to surrender.
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