Albert Barnes' Notes on the Whole Bible - Deuteronomy 20:10-20
Directions intended to prevent wanton destruction of life and property in sieges.Deuteronomy 20:16Forbearance, however, was not to be shown toward the Canaanite nations, which were to be utterly exterminated (compare Deuteronomy 7:1-4). The command did not apply to beasts as well as men (compare Joshua 11:11, Joshua 11:14).Deuteronomy 20:19The parenthesis may he more literally rendered “for man is a tree of the field,” i. e., has his life from the tree of the field, is supported in life by it... read more
The Pulpit Commentary - Deuteronomy 20:16-20
This was for cities at a distance; it was to be otherwise with the cities of the Canaanites. To them no offer of peaceful submission was to be made, and when the city was taken, all the inhabitants without reserve were to be destroyed. This was in accordance with God's command to Israel ( Exodus 23:31-33 ; Exodus 34:11-16 ; Deuteronomy 7:1-3 ), and as a precaution against the risk of the people being seduced into idolatry by the heathen should they be allowed to remain in the land. But... read more