Overall meaning : Allah, Exalted and Sublime be He, says: Believers, remember Allah’s favour towards you when the enemy forces came down upon you and He repelled them by unleashing against them a fierce wind and armies of angels that you could not see; Allah saw all that you were doing.
Remember when the Confederates attacked you from the east and from the west, so that your eyes rolled in terror, your hearts leapt up to your throats due to intense fear, and diverse thoughts about Allah passed through your minds. With such immense distress, the faithful were sorely tested and deeply shaken.