And surely Lord Allah has helped you at Badr while you were weak, therefore you heed Allah so that you might become grateful.
In the Battle of Badr 313 weak soldiers without having any experience in battle as well as without having proper weapons fought with thousand of powerful armed Meccan pagans. But the believers won the battle since they belonged to the Believer Lord’s Party as told in verse 58: 22. The disbelievers were defeated since they belonged to the disbeliever Satan’s party as told in verse 58: 19.
Impartial Lord has given mankind the freedom either to be grateful or ungrateful as told in verses 76: 3; 90: 10 and 91: 8-10. Today, to heed Lord means to holdfast Adhikr as explained in verse 2: 2. See explanation 2: 152 and 3: 101-103.