“And I, in the first year of Darius the Mede, stood up to strengthen and protect him.
Interpreters explain this verse in various ways. Some think the angel fought for the Persian king, and follow up their opinion, because he did not for the first time begin now to defend that monarchy in favor of the chosen people, but had done so from the very beginning. Others refer this to Michael, as the angel declares that he introduced the assistance of Michael.
Here, 1. The angel Gabriel lets Daniel know the good service he has done to the Jewish nation (Dan 11:1): "In the first year of Darius the Mede, who destroyed Babylon and released the Jews out of that house of bondage, I stood a strength and fortress to him, that is, I was instrumental to protect him, and give him success in his ward, and...
Commenting on Daniel 11:1-4
Also I, in the first year of Darius the Mede,.... These words more properly belong to the preceding chapter, and should have concluded that, and the "eleventh" chapter should have begun in the next verse; and they are not the words of Daniel, as Jerom and others; but of the angel telling Daniel, not only what he had been lately doing, and would do in...