What does the conclusion of Jephthah’s historical argument confirm?
Judges 11:22 (ESV)
22And they took possession of all the territory of the Amorites from the Arnon to the Jabbok and from the wilderness to the Jordan.
It confirms that Ammon has no historical claim to the disputed land. After the battle with the Amorites, the territory passed into the hands of the Israelites.
22 And they took possession of all the territory of the Amorites from the Arnon to the Jabbok and from the wilderness to the Jordan.