(O ye who believe Remember Allah's favour unto you) preserve Allah's favour in that He repelled the enemy from you by sending the east wind and angels (when there came against you hosts) the host of disbelievers, (and We sent against them a great wind) the east wind (and hosts) and a row of angels (you could not see. And Allah is ever Seer of what ye do) whether it is the digging of the trench or other things.