Knights Without Parachutes — tolkien

Attack in the Third Dimension But now wheeling swiftly across [the river], like shadows of untimely night, he saw in the middle airs below him five birdlike forms, horrible as carrion-fowl yet greater than eagles, cruel as death. Now they swooped near, venturing almost within bowshot of the walls, now they circled away. But now the dark swooping shadows were aware of [Gandalf]. One whirled towards him; but it seemed to Pippin that he raised his hand, and from it a shaft of white light stabbed upwards. The Nazgul gave a long wailing cry and swerved away; and with that...