Judges 10:17

Then the children of Ammon were gathered together, and encamped in Gilead. And the children of Israel assembled themselves together, and encamped in Mizpeh.

The children of Ammon were gathered together. From carrying on a guerilla warfare, the Ammonites proceeded to a continued campaign, their settled aim being to wrest the whole of the trans-Jordanic territory from their actual occupiers. In this great crisis a general meeting of the Israelite tribes was held at Mizpeh. This Mizpeh was in eastern Manasseh (Joshua 11:3).