&quot;... Frodo and Sam ... saw a shape, moving at a great speed out of the West, at first only a black speck ... above the mountain-tops, but growing, until it ... passed high above them. As it went it sent out a long shrill cry, the voice of a Nazgûl; but this cry no longer held any terror for them: it was a cry of woe and dismay, ill tidings for the Dark Tower. The Lord of the Ringwraiths had met his doom.&quot;  -  The Return of the King, LoTR Book 6, Ch 2, The Land of Shadow