This is a very important verse to understand what is happening during the GreatTribulation.
There is war in heaven. -> There are the Lord^s angels and -> there are Satan^s angels.
In most passages throughout the Bible the term AngelOfTheLord or HisAngel is used to make it clear whose person they represent.
In John^s vision those terms are not used. I suspect this is because He is not told who they represent - only what they do. We can assume the angels are from the Lord, but that is likely not the case.
Jesus tells us that He will send HisAngels to gather the wheat to Him Mat 24:31 and to gather the tares into bundles to be burned Mat 13:41. He does not tell us of destructive angels which appear in the Revelation. Since, He did not speak of such, I can only assume that the destructive angels in Revelation are working at the behest of Satan.