Judges 11:23
So now the LORD God of Israel hath dispossessed the Amorites from before his people Israel, and shouldest thou possess it? So now the LORD God of Israel hath dispossessed the Amorites from before his people Israel, and shouldest thou possess it?
This declaration stands within Jephthah's confrontation with the Ammonites. In that conflict he took up the cause of Israel and defended the nation against their assault. His leadership ended in victory that crushed Ammonite power.