By God's command, these being a part of those people who were devoted by the Lord of life and death to utter destruction for their abominable wickedness. See Deuteronomy 7:2, Deuteronomy 20:16.
Related Commentaries of Deuteronomy 2:34
Deuteronomy 2:34
34 And we took all his cities at that time, and utterly destroyed the men,h and the women, and the little ones, of every city, we left none to remain: