Eagles were mighty beasts that lived in the Misty Mountains. In The Hobbit, they flew Thorin Oakenshield and company to Mirkwood forest. When Gandalf the Grey was captured by Saruman and imprisoned at the top of the tower of Orthanc (Saruman's tower), Gandalf told a Moth to find Gwaihir, lord of all Eagles, and rescue him from the wicked wizard. Gwaihir did so. When the forces of Gondor and Rohan fought Sauron's armies at The Black Gate, Gwaihir and his scouts killed all of the Nazgul but The Witch-King, who was killed by Eowyn in the Battle of the Pelennor Fields.