Judges 11:18-21

Then they went through the wilderness and went around the land of Edom and the land of Moab, and came to the east side of the land of Moab, and they camped on the other side of the [river] Arnon; but they did not enter the territory of Moab, for the Arnon was the [northern] boundary of Moab. Then Israel sent messengers to Sihon king of the Amorites, 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 together all his people and camped at Jahaz and fought against Israel. The LORD, the God of Israel, gave Sihon and all his people into the hand of Israel, and they defeated them; so Israel took possession of all the land of the Amorites, the inhabitants of that country.