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 for the destruction of Judah; but the Lord turned them against their own confederates, mistaking them for Jews; so the Vulgate Latin version, "the Lord turned their ambushments against themselves;''or rather these were angels, who appeared in the form of the Edomites, and so fell upon the Ammonites and Moabites: and they were smitten; by them, many of them were destroyed; hence it follows,