Revelation 12:3,4

Vs. 3, 4 And there appeared a great red dragon, having seven heads and ten horns, and seven crowns on his heads. His tail drew the third part of the stars, and did cast them to the earth, and the dragon stood before the woman to devour her child as soon as it was born.

There is no difficulty about the identity of the dragon, for in verse nine he is described as "the great dragon, that old serpent, called the Devil and Satan." That settles who he is. "His tail drew a third part of the stars," fallen angels perhaps, or wicked men in high places. That they followed his tail may be an expression of contempt for the foolishness and baseness of their allegiance. At least he went before and they followed. And there are men as well as fallen angels that are assiduous and devoted followers of the Devil's tail; and they follow the Devil's tail more readily than some nobler and worthier leader.

Now the Devil was quick at strategy, and designed to destroy the woman's offspring as soon as it was born. He was early on the job, to gain the first signal advantage and forestall all comers. But there is one quicker and mightier than he for whom the Devil is no match; as we shall see.