The Laws concerning War

201 When you go out to war against other nations, and come face to face with horses and war-carriages and armies greater in number than yourselves, have no fear of them: for the Lord your God is with you, who took you up out of the land of Egypt.

Matthew Henry's Commentary on Deuteronomy 20:1

Commentary on Deuteronomy 20:1-9

(Read Deuteronomy 20:1-9)

In the wars wherein Israel engaged according to the will of God, they might expect the Divine assistance. The Lord was to be their only confidence. In these respects they were types of the Christian's warfare. Those unwilling to fight, must be sent away. The unwillingness might arise from a man's outward condition. God would not be served by men forced against their will. Thy people shall be willing, Isaiah 8:12.