The LORD, Israel's God, handed over Sihon and his entire army to the Israelites, and they defeated Sihon. So the Israelites took possession of all the land of the Amorites who were living in that area.
They took possession of all the Amorite territory from the Arnon to the Jabbok and from the desert to the Jordan.
"So now that the LORD, Israel's God, has driven out the Amorites before his people Israel, will you take possession of their land?
Shouldn't you possess what Chemosh your god has given you to possess? And shouldn't we possess everything that the LORD our God has given us to possess?
Do you now have a better case than Moab's King Balak, Zippor's son? Did he make an accusation against the Israelites or go to war with them?
Why didn't you take back this territory while the Israelites lived in Heshbon and its villages, in Aroer and its villages, and in all the towns along the branches of the Arnon for three hundred years?
I haven't sinned against you, but you're doing me wrong by making war against me. Let the LORD, who is the judge, decide today between the Israelites and the Ammonites!"
But the Ammonite king refused to listen to the message that Jephthah sent to him.
Then the LORD's spirit came on Jephthah. He passed through Gilead and Manasseh, then through Mizpah in Gilead, and from there he crossed over to the Ammonites.
References for Judges 11:29
Jephthah made a solemn promise to the LORD: "If you will decisively hand over the Ammonites to me,
then whatever comes out the doors of my house to meet me when I return victorious from the Ammonites will be given over to the LORD. I will sacrifice it as an entirely burned offering."