Battle of the Pelennor Fields
Éomer plays a major role in the Battle of the Pelennor Fields, the pivotal battle of "The Return of the King" against the forces of the Dark Lord Sauron from Mordor. After leading a successful cavalry charge, he is dismayed to find Théoden mortally wounded. Théoden appoints him King of Rohan with his dying breath. Seeing Éowyn seemingly dead on the battlefield, Éomer throws himself and the remaining Rohirrim at the enemy. Aragorn arrives unexpectedly from Pelargir, and joins forces with Éomer, fulfilling his prediction that they would meet in the midst of their enemies. They rout the Orcs and win the battle.