Judges 10:9, 17-18

The sons of Ammon crossed the Jordan to fight also against Judah, Benjamin, and the house of Ephraim, so that Israel was greatly distressed.

Then the sons of Ammon were summoned and they camped in Gilead. And the sons of Israel gathered together and camped in Mizpah. The people, the leaders of Gilead, said to one another, “Who is the man who will begin to fight against the sons of Ammon? He shall become head over all the inhabitants of Gilead.”