Things were looking pretty bad again, when suddenly Bilbo reappeared, and charged into the astonished spiders unexpectedly from the side.
“Go on! Go on!” he shouted. “I will do the stinging!”
And he did. He darted backwards and forwards, slashing at spider-threads, hacking at their legs, and stabbing at their fat bodies if they came too near. The spiders swelled with rage, and spluttered and frothed, and hissed out horrible curses; but they had become mortally afraid of Sting, and dared not come very near, now that it had come back. So curse as they would, their prey moved slowly but steadily away. It was a most terrible business, and seemed to take hours. But at last, just when Bilbo felt that he could not lift his hand for a single stroke more, the spiders suddenly gave it up, and followed them no more, but went back disappointed to their dark colony.

Chapter 8 Flies and Spiders