﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ ٱذْكُرُوا۟ نِعْمَةَ ٱللَّهِ عَلَيْكُمْ إِذْ جَآءَتْكُمْ جُنُودٌۭ فَأَرْسَلْنَا عَلَيْهِمْ رِيحًۭا وَجُنُودًۭا لَّمْ تَرَوْهَا ۚ وَكَانَ ٱللَّهُ بِمَا تَعْمَلُونَ بَصِيرًا ﴾

“O YOU who have attained to faith! Call to mind the blessings which God bestowed on you (at the time) when [enemy] hosts came down upon you, where­upon We let loose against them a storm wind and [heavenly] hosts that you could not see: yet God saw all that you did.”

(O ye who believe Remember Allah's favour unto you) preserve Allah's favour in that He repelled the enemy from you by sending the east wind and angels (when there came against you hosts) the host of disbelievers, (and We sent against them a great wind) the east wind (and hosts) and a row of angels (you could not see. And Allah is ever Seer of what ye do) whether it is the digging of the trench or other things.