20:20-30 Jehoshaphat exhorted his troops to firm faith in God. Faith inspires a man with true courage; nor will any thing help more to the establishing of the heart in shaking times, than a firm belief of the power, and mercy, and promise of God. In all our trust in the Lord, and our praises of him, let us especially look at his everlasting mercy to sinners through Jesus Christ. Never was an army so destroyed as that of the enemy. Thus God often makes wicked people destroy one another. And never was a victory celebrated with more solemn thanksgivings.

2Ch 20:22-30. The Overthrow of His Enemies.

22. when they began to sing and to praise the Lord set ambushments against the children of Ammon, Moab, and Mount Seir—Some think that this was done by angels in human form, whose sudden appearance diffused an uncontrollable panic. Others entertain the more probable opinion that, in the camp of this vast horde, composed of different tribes, jealousies and animosities had sprung up, which led to widespread dissensions and fierce feuds, in which they drew the sword against each other. The consequence was, that as the mutual strife commenced when the Hebrew procession set out from Jerusalem, the work of destruction was completed before Jehoshaphat and his people arrived at the battlefield. Thus easy is it for God to make the wrath of man to praise Him, to confound the counsels of His enemies and employ their own passions in defeating the machinations they have devised for the overthrow of His Church and people.