Concise Quran Commentary
Allah helped the believers against their enemies, the idolaters, in many battles, despite their small numbers and shortage of weapons, when they trusted in Allah and took appropriate measures. The believers should not be simply pleased by being a great number, because this is not the reason for them beating their enemy. On the day of Ḥunayn, when they were pleased by their great numbers, they said that they would not be defeated on that day because of small numbers; but their great numbers which pleased them did them no good, with their enemies overcoming them, and the earth becoming narrow for them despite its vastness. Then they turned from their enemies, fleeing in defeat.