In a cave within that rock, where they fortified themselves and fetched in provision as they had opportunity; which they could easily do, when the heat of the battle was over, and the Israelites were not solicitous to pursue them farther.
Related Commentaries of Judges 20:47
Judges 20:47
47 But six hundred men turned and fled to the wilderness unto the rock Rimmon, and abode in the rock Rimmon four months.