god gave confidence to his messenger and the believers and helped them with an army which you could not see. god punished the unbelievers this is the only recompense that the unbelievers deserve.
ثم أنزل الله سكينته على رسوله وعلى المؤمنين وأنزل جنودا لم تروها وعذب الذين كفروا وذلك جزاء الكافرين