Some time later, when the Ammonites fought against Israel

Judges 10:9
The Ammonites also crossed the Jordan to fight against Judah, Benjamin, and the house of Ephraim, and Israel was in deep distress.

Judges 10:17
Then the Ammonites were called to arms and camped in Gilead, and the Israelites assembled and camped at Mizpah.

Judges 11:5
and made war with them, the elders of Gilead went to get Jephthah from the land of Tob.

And it came to pass in process of time, that the children of Ammon made war against Israel.