The Israelites sent ambassadors to King Sihon of the Amorites with this message:
“Let us travel through your land. We will be careful not to go through your fields and vineyards. We won’t even drink water from your wells. We will stay on the king’s road until we have passed through your territory.”
But King Sihon refused to let them cross his territory. Instead, he mobilized his entire army and attacked Israel in the wilderness, engaging them in battle at Jahaz.
But the Israelites slaughtered them with their swords and occupied their land from the Arnon River to the Jabbok River. They went only as far as the Ammonite border because the boundary of the Ammonites was fortified.
References for Numbers 21:24
So Israel captured all the towns of the Amorites and settled in them, including the city of Heshbon and its surrounding villages.
Heshbon had been the capital of King Sihon of the Amorites. He had defeated a former Moabite king and seized all his land as far as the Arnon River.
Therefore, the ancient poets wrote this about him: “Come to Heshbon and let it be rebuilt! Let the city of Sihon be restored.
A fire flamed forth from Heshbon, a blaze from the city of Sihon. It burned the city of Ar in Moab; it destroyed the rulers of the Arnon heights.
What sorrow awaits you, O people of Moab! You are finished, O worshipers of Chemosh! Chemosh has left his sons as refugees, his daughters as captives of Sihon, the Amorite king.
We have utterly destroyed them, from Heshbon to Dibon. We have completely wiped them out as far away as Nophah and Medeba. ”
References for Numbers 21:30
So the people of Israel occupied the territory of the Amorites.
After Moses sent men to explore the Jazer area, they captured all the towns in the region and drove out the Amorites who lived there.
Then they turned and marched up the road to Bashan, but King Og of Bashan and all his people attacked them at Edrei.
The said to Moses, “Do not be afraid of him, for I have handed him over to you, along with all his people and his land. Do the same to him as you did to King Sihon of the Amorites, who ruled in Heshbon.”
And Israel killed King Og, his sons, and all his subjects; not a single survivor remained. Then Israel occupied their land.