HESHBON is mentioned first in connection with the Is- raelite invasion of an area in Transjordan some 40 years after the Exodus. At that time Heshbon was the capital of Sihon, king of the Am- orites. However, according to Num- bers 21:26-30, Sihon had expelled the Moabites from Heshbon, hence the Moabites must have been in possession of that city prior to the arrival of the Amorites. This is further confirmed by the fact that in the writings of Moses (Num. 22:1; 31:12; 33:48; 36:13; Deut. 34:5, 6) the area surrounding Heshbon was called "the plain of Moab" or "the land of Moab." However, in Moses' time the northern border of Moab was the river Arnon, some 25 miles south of Heshbon.
Review and Herald
Horn, Siegfried H., "Heshbon's History" (1969). Publications. 2.