§ Of Túrin Turambar The Silmarillion

Then Turambar summoned all his will and courage and climbed the cliff alone, and came beneath the dragon. Then he drew Gurthang, and with all the might of his arm, and of his hate, he thrust it into the soft belly of the Worm, even up to the hilts. But when Glaurung felt his death-pang, he screamed, and in his dreadful throe he heaved up his bulk and hurled himself across the chasm, and there lay lashing and coiling in his agony. And he set all in a blaze about him, and beat all to ruin, until at last his fires died, and he lay still.