During the battle, Bilbo puts the ring on his finger.
We can arrive at this answer because:
- Chapter 17 of "The Hobbit" shows that a war between dwarves, elves, and men was being waged.
- Bilbo watches this battle from afar, but realizes that the environment is getting too dangerous.
- He decides to run away and so he puts the ring on his finger, as the ring makes him invisible and that would allow no one to see him.
However, he is hit on the head by a rock, which renders him unconscious. He is found hours later by Gandalf.
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