Judges 11:12-15, 32-33

Jephthah sent messengers to the king of the Ammonites, asking, “What have you got against Israel? Why have you come to attack our land?” The king of the Ammonites answered the messengers of Jephthah, “We are fighting Israel because you took our land when you came up from Egypt. You took our land from the Arnon River to the Jabbok River to the Jordan River. Now give our land back to us peacefully.” Jephthah sent the messengers to the Ammonite king again. They said: “This is what Jephthah says: Israel did not take the land of the people of Moab or Ammon.

Then Jephthah went over to fight the Ammonites, and the LORD handed them over to him. In a great defeat Jephthah struck them down from the city of Aroer to the area of Minnith, and twenty cities as far as the city of Abel Keramim. So the Ammonites were defeated by the Israelites.