The Spoils of War - 8:11
He was lulling you to sleep as a security from Himself, and He was sending down upon you water from the sky to cleanse you (from the depression of thirst), to drive away from you the filth of Satan (despair), to convince your hearts and to strengthen your feet.
What is the intention?
The Cow/2:250
"When they met Goliath and his army, they said: "Our Lord, give us strength to resist, keep our feet firm, and help us against the disbelievers."
The Family Of Imran/3:147
"Their words were only this: "Our Lord, forgive us our sins and our excesses, and keep our feet firm, and give us victory over the disbelieving people."