They hired thirty-two thousand chariots and charioteers, as well as the king of Maakah with his troops, who came and camped near Medeba, while the Ammonites were mustered from their towns and moved out for battle.
Heshbon was the city of Sihon king of the Amorites, who had fought against the former king of Moab and had taken from him all his land as far as the Arnon.
Of the land that we took over at that time, I gave the Reubenites and the Gadites the territory north of Aroer by the Arnon Gorge, including half the hill country of Gilead, together with its towns.
Sihon king of the Amorites, who reigned in Heshbon. He ruled from Aroer on the rim of the Arnon Gorge—from the middle of the gorge—to the Jabbok River, which is the border of the Ammonites. This included half of Gilead.
It extended from Aroer on the rim of the Arnon Gorge, and from the town in the middle of the gorge, and included the whole plateau of Medeba as far as Dibon,
The Levites, however, do not get a portion among you, because the priestly service of the Lord is their inheritance. And Gad, Reuben and the half-tribe of Manasseh have already received their inheritance on the east side of the Jordan. Moses the servant of the Lord gave it to them.”
For three hundred years Israel occupied Heshbon, Aroer, the surrounding settlements and all the towns along the Arnon. Why didn’t you retake them during that time?