We do know that historically angels have aided the people of God in conflict with their enemies. God has even at times dispatched armies of angels to stand against the enemies of God' people. For example: Do you remember the story of Elisha and Gechazi?
"Then Elisha prayed and said, “O LORD, I pray, open his eyes that he may see.” And the LORD opened the servant’s eyes and he saw; and behold, the mountain was full of horses and chariots of fire all around Elisha" 2Kings 6:17. Although Michael is not mentioned here, this is a perfect example of God dispatching his angels to contend with the armies of Samaria.