Revelation 12:[7] Now war arose in heaven, Michael and his angels fighting against the dragon; and the dragon and his angels fought,
[8] but they were defeated and there was no longer any place for them in heaven.
[9] And the great dragon was thrown down, that ancient serpent, who is called the Devil and Satan, the deceiver of the whole world – he was thrown down to the earth, and his angels were thrown down with him.
and
Jude [9] But when the archangel Michael, contending with the devil, disputed about the body of Moses, he did not presume to pronounce a reviling judgment upon him, but said, “The Lord rebuke you.”
and
Daniel 10:[13] The prince of the kingdom of Persia withstood me twenty-one days; but Michael, one of the chief princes, came to help me, so I left him there with the prince of the kingdom of Persia [14] and came to make you understand what is to befall your people in the latter days. For the vision is for days yet to come." …[20] Then he said, "Do you know why I have come to you? But now I will return to fight against the prince of Persia; and when I am through with him, lo, the prince of Greece will come.
Maybe that will give you some insight.
BTW, realize that based upon Matthew 18:10, we all have a guardian angel. I think that is way cool! Mainly because of the love of God that that shows me.