الآية رقم (26) - ثُمَّ أَنَزلَ اللّهُ سَكِينَتَهُ عَلَى رَسُولِهِ وَعَلَى الْمُؤْمِنِينَ وَأَنزَلَ جُنُودًا لَّمْ تَرَوْهَا وَعذَّبَ الَّذِينَ كَفَرُواْ وَذَلِكَ جَزَاء الْكَافِرِينَ

(26) - (Then Allah sent down His tranquility upon His Messenger and upon the believers and sent down armies of angels whom you did not see and punished those who disbelieved. And that is the recompense of the disbelievers.)

After the initial defeat, Allah (swt) sent tranquility upon the Messenger of Allah (saws). Allah (swt) also sent unseen armies that fought alongside him. Not everything unseen is nonexistent, and such matters are not beyond the might of Allah.