﴿ 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.”

Please check ayah 33:10 for complete tafsir.