Thus Moses said: If I rebuke Israel first, they will say: Because he has no strength he rebukes us! But after they entered the land of Sichon and Og and he defeated them, he rebuked them. Thus, ”after he had smitten Sichon, etc."
"Sichon, king of the Emori, who dwelt in Cheshbon": (Even) if Sichon were not formidable, but he lived in Cheshbon, it would be difficult (to defeat them), the (inhabitants of the) land being formidable. And (even) if the land were not formidable, but Sichon dwelt therein, it would be difficult, the king being formidable. How much more so, when both the king and the land are formidable!