'Hostile' in the Bible

Then he said, “Do you understand [fully] why I came to you? Now I shall return to fight against the [hostile] prince of Persia; and when I have gone, behold, the prince of Greece is about to come.

But I (Gabriel) will tell you what is inscribed in the writing of truth. There is no one who stands firmly with me and strengthens himself against these [hostile spirit forces] except Michael, your prince [the guardian of your nation].