Albert Barnes Commentary Judges 20:45

"And they turned and fled toward the wilderness unto the rock of Rimmon: and they gleaned of them in the highways five thousand men, and followed hard after them unto Gidom, and smote of them two thousand men." — Judges 20:45 (ASV)

Rimmon - A village named “Rummon”, situated on the summit of a conical chalky hill, still exists and forms a remarkable object in the landscape, visible in all directions. It lies 15 miles north of Jerusalem. It is a different place from Rimmon in the south of Judah (Joshua 15:32) and Remmon in Zebulon (Joshua 19:13). Gidom, mentioned nowhere else, was evidently close to Rimmon.