God caused the sea to go back by a strong east wind, the wind He always makes use of when He chastises the nations. The same east wind had brought the deluge; it had laid the tower of Babel in ruins; it was to cause the destruction of Samaria, Jerusalem, and Tyre; and it will, in future, be the instrument for castigating Rome drunken with pleasure; and likewise the sinners in Gehenna are punished by means of the east wind.
All night long God made it to blow over the sea. To prevent the enemy from inflicting harm upon the Israelites, He enveloped the Egyptians in profound darkness, so impenetrable it could be felt, and none could move or change his posture. He that sat when it fell could not arise from his place, and he that stood could not sit down. Nevertheless, the Egyptians could see that the Israelites were surrounded by bright light, and were enjoying a banquet where they stood, and when they tried to speed darts and arrows against them, the missiles were caught up by the cloud and by the angels hovering between the two camps, and no harm came to Israel.