Daniel 10:1, 21

In the third year of Cyrus king of Persia a message was revealed to Daniel, who was named Belteshazzar; and the message was true and it referred to great conflict (warfare, misery). And he understood the message and had an understanding of the vision. [Dan 8:26; Rev 19:9]

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].