Joseph Benson's Commentary of the Old and New Testaments - Deuteronomy 20:1
Deuteronomy 20:1. When thou goest out to battle against thine enemies The land of Canaan being to be gained by conquest, in a war of God’s special appointment; and the Israelites, after their settlement in it, being likely to be exposed to invasions from, or quarrels with the neighbouring nations, Moses judged it necessary to leave them some standing rules for their conduct in both these kinds of war. The first and great rule was, to commit their cause to God, depending with entire... read more
Albert Barnes' Notes on the Whole Bible - Deuteronomy 20:1
Horses, and chariots - The most formidable elements of an Oriental host, which the Canaanites possessed in great numbers; compare Joshua 17:16; Jdg 4:3; 1 Samuel 13:5. Israel could not match these with corresponding forces (compare Deuteronomy 17:16 note and references), but, having the God of battles on its side, was not to be dismayed by them; the assumption being that the war had the sanction of God, and was consequently just. read more