Remember thou saidst to the Faithful: “Is it not enough for you that Allah should help you with three thousand angels (Specially) sent down?
“Yea, – if ye remain firm, and act aright, even if the enemy should rush here on you in hot haste, your Lord would help you with five thousand angels Making a terrific onslaught.
It is not unreasonable to assume that God could send angels to assist the forces of righteousness on the battlefield. The Old Testament promises that God will send hornets to help drive the enemies of the Children of Israel away! See Exodus 23:28.
Emerick, Yahiya. The Meaning of the Holy Qur’an in Today’s English (p. 829). Unknown. Kindle Edition.