In The Two Towers:
Following the drowning of their steeds at the Ford of Bruinen, the Nazgûl reappeared riding Winged Beasts, which are also known as Fell Beasts. A Nazgul riding a Winged Beast flies over the Dead Marshes sending Frodo, Gollum and Sam looking for cover. Later, Faramir brings the three to Osgiliath intending to turn Frodo and the Ring over to his father Denethor II, Steward of Gondor. A Nazgûl riding a Winged Beast draws Frodo to a high point where he nearly hands over the Ring. Sam stops him and Faramir wounds the Winged Beast driving the Nazgûl off.
In The Return of the King: Nazgûl riding Winged Beasts harass the retreat from Osgiliath as it is overrun by the Orc army. They also participate in the attack on Minas Tirith. When the last battle takes place at the Black Gate of Mordor, they are there, but driven off by the Eagles.
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