Thematic Bible: Sihon conquered

But Sihon would not allow Israel to pass through his border. Instead Sihon gathered all his people together and went out against Israel into the wilderness, and came to Jahaz, and he fought against Israel. And Israel smote the king of the Amorites with the edge of the sword and possessed his land from the river Arnon to the river Jabbok, as far as the Ammonites, for the boundary of the Ammonites was strong. And Israel took all these cities and dwelt in all the cities of the Amorites, in Heshbon and in all its towns. read more.
For Heshbon was the city of Sihon king of the Amorites, who had fought against the former king of Moab and taken all his land out of his hand, as far as [the river] Arnon. That is why those who sing ballads say, Come to Heshbon, let the city of Sihon be built and established. For fire has gone out of Heshbon, a flame from the city of Sihon; it has devoured Ar of Moab and the lords of the heights of the Arnon. Woe to you, Moab! You are undone, O people of [the god] Chemosh! Moab has given his sons as fugitives and his daughters into captivity to Sihon king of the Amorites. We have shot them down; Heshbon has perished as far as Dibon, and we have laid them waste as far as Nophah, which reaches to Medeba. Thus Israel dwelt in the land of the Amorites. And Moses sent to spy out Jazer, and they took its villages and dispossessed the Amorites who were there.

Then Sihon came out against us, he and all his people, to fight at Jahaz. And the Lord our God gave him over to us, and we defeated him and his sons and all his people. At the same time we took all his cities and utterly destroyed every city -- "men, women, and children. We left none to remain. read more.
Only the cattle we took as booty for ourselves and the spoil of the cities which we had captured. From Aroer, which is on the edge of the Arnon Valley, and from the city that is in the valley, as far as Gilead, there was no city too high and strong for us; the Lord our God delivered all to us.