Numbers 21:30 - Matthew Poole's English Annotations on the Holy Bible

Though you feeble Moabites, and your god too, could not resist Sihon, we Israelites, by the help of our God, have shot, to wit, with success and victory, as the following words show, at them, to wit, at Sihon and his Amorites; which is easily and plainly understood, both from the foregoing and following words. Heshbon, the royal city of Sihon, and by him lately repaired, is perished, is taken away from Sihon, and so is all his territory or country, even as far as Dibon, which, as some think is called Dibon-gad, Numbers 33:45. Which reached unto Medeba, i.e. whose territory extendeth to Medeba. Or, yea, even to Medeba; for the Hebrew word asher is sometimes used for yea, or moreover, as 1 Samuel 15:20 Psalms 10:6, Psalms 95:11. The sense is, the whole country of Sihon, taken by him from the Moabites, is wasted and perished.