Their border was from Aroer, that is on the edge of the valley of the Arnon, and the city that is in the middle of the valley, and all the plain by Medeba;
So they hired for themselves thirty-two thousand chariots, and the king of Maacah with his people, who came and encamped near Medeba. The children of Ammon gathered themselves together from their cities, and came to battle.
For Heshbon was the city of Sihon the king of the Amorites, who had fought against the former king of Moab, and taken all his land out of his hand, even to the Arnon.
This land we took in possession at that time: from Aroer, which is by the valley of the Arnon, and half the hill country of Gilead with its cities, I gave to the Reubenites and to the Gadites;
Sihon king of the Amorites, who lived in Heshbon, and ruled from Aroer, which is on the edge of the valley of the Arnon, and the middle of the valley, and half Gilead, even to the river Jabbok, the border of the children of Ammon;
However, the Levites have no portion amongst you; for the priesthood of the LORD is their inheritance. Gad, Reuben, and the half-tribe of Manasseh have received their inheritance east of the Jordan, which Moses the servant of the LORD gave them.”
Israel lived in Heshbon and its towns, and in Aroer and its towns, and in all the cities that are along the side of the Arnon for three hundred years! Why didn’t you recover them within that time?