Who Sent Yisrael Out of Mitzrayim?

"And Pharaoh arose at night..." (Shmos 12:30)

Kings do not arise at night to leave their palaces. But when Hashem decrees, even a king arises at night to do His bidding... It was thus demonstrated that it was not Pharaoh but Hashem that had kept them in Egypt, just as it was not Pharaoh but Hashem that released them from Egypt. — Zichron Avner Hagada