Allah made each Group look few in the Eye of the Other

Mujahid said, "In a dream, Allah showed the Prophet the enemy as few. The Prophet conveyed this news to his Companions and their resolve strengthened." Similar was said by Ibn Ishaq and several others. Allah said,

وَلَوْ أَرَاكَهُمْ كَثِيراً لَّفَشِلْتُمْ

Mentioned in verses 43 and 44, there is particular marvel of Divine power which was designed to take place at the battle of Badr for the express purpose of making sure that none of the two armies were to put an end to the war itself by deserting the battlefield - because, it was as a result of this very war that the manifestation of the veracity of Islam was destined even as a ground reality, all earthy, material.

Such was the nature of this Divine marvel that the army of the disbelievers which was though three times larger than that of Muslims, yet Allah Ta` ala, by His perfect power alone, made their, number appear much less to Muslims so that it may not cause any difference of opinion or sense of weakness to affect them. This event took place twice. Once, it was shown to the Holy Prophet ﷺ in a dream which he related to all of them and which renewed their courage and resolve. The second time, when the two groups stood facing each other on the battlefield itself, their number was shown to Muslims as being small. The event mentioned in verse 43 relates to the dream and that in verse 44 to a state when they were wide awake.