Judges 10:9, 17-18

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

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