Tyrion and Bronn prepare for the night on the High Road. Tyrion wants to light a fire to bring the clansmen to them, which Bronn thinks is suicidal. But since Tyrion is paying so well, he stays.
Tyrion shares a story with Bronn about the woman he married, named Tysha. (It's a sad story and very important for the later books, so definitely take a few minutes to read it.)
When the clansmen come to kill Tyrion and Bronn, Tyrion convinces them that they'll get more by joining him than they would by killing him. He'll give them the Vale of Arryn if they follow him into battle. So they do.