And when they began to sing and praise, the LORD set an ambush against the men of Ammon, Moab, and Mount Seir, who had come against Judah, so that they were routed.
We have here the foregoing prayer answered and the foregoing promise performed, in the total overthrow of the enemies' forces and the triumph (for so it was rather than a victory) of Jehoshaphat's forces over them. I. Never was army drawn out to the field of battle as Jehoshaphat's was.
Commenting on 2 Chronicles 20:20-30
And when they began to sing and to praise,.... They sung more or less all the way they went, from the time they set out, but when they came nearer the enemy, they sung louder and louder: the Lord set ambushments against the children of Ammon, Moab, and Mount Seir, which came against Judah; some take them to be their own ambushments, which they set...
THE OVERTHROW OF HIS ENEMIES. (Ch2 20:22-30) 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.