Judges 11:18-22

Then they went through the wilderness and around the land of Edom and the land of Moab, and came to the east side of the land of Moab, and they camped beyond the Arnon; but they did not enter the territory of Moab, for the Arnon was the border of Moab.

And Israel sent messengers to Sihon king of the Amorites, the king of Heshbon; and Israel said to him, “Please let us pass through your land to our place.”

But Sihon did not trust Israel to pass through his territory; so Sihon gathered all his people and camped in Jahaz, and fought with Israel.

And the Lord, the God of Israel, handed Sihon and all his people over to Israel, and they defeated them; so Israel took possession of all the land of the Amorites, the inhabitants of that country.

So they possessed all the territory of the Amorites, from the Arnon as far as the Jabbok, and from the wilderness as far as the Jordan.