Legolas kills a great wolf-chieftain

‘Naur an edraith ammen! Naur dan i ngaurhoth!’ he cried.

There was a roar and a crackle, and the tree above him burst into a leaf and bloom of blinding flame. The fire leapt from tree-top to tree-top. The whole hill was crowned with dazzling light. The swords and knives of the defenders shone and flickered. The last arrow of Legolas kindled in the air as it flew, and plunged burning into the heart of a great wolf-chieftain. All the others fled.

Slowly the fire died till nothing was left but falling ash and sparks; a bitter smoke curled above the burned tree-stumps, and blew darkly from the hill, as the first light of dawn came dimly in the sky. Their enemies were routed and did not return.

‘What did I tell you, Mr. Pippin?’ said Sam, sheathing his sword. ‘Wolves won’t get him. That was an eye-opener, and no mistake! Nearly singed the hair off my head!’

The Fellowship of the Ring, Book Two, Chapter 4: A Journey in the Dark.