Deuteronomy 2:34

And we took all his cities at that time,.... As Heshbon, and others mentioned in Numbers 21:25,

and utterly destroyed the men, and the women, and the little ones of every city, we left none to remain; for the Amorites were one of the seven nations who were devoted to destruction, the measure of whose iniquity was now full, and therefore vengeance was taken.