There has already been a sign for you (O Jews) in the two armies that met (in combat i.e. the battle of Badr). One was fighting in the Cause of Allâh, and as for the other, (they) were disbelievers. They (the believers) saw them (the disbelievers) with their own eyes twice their number (although they were thrice their number). And Allâh supports with His Victory whom He wills. Verily, in this is a lesson for those who understand. (See Verse 8:44). (Tafsir At-Tabarî)

Indeed, there was a sign for you in the two armies that met in battle—one fighting for the cause of Allah and the other in denial. The believers saw their enemy twice their number.¹ But Allah supports with His victory whoever He wills. Surely in this is a lesson for people of insight.