Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Bukhari :: Book 6 :: Volume 60 :: Hadith 84
Narrated Al-Bara bin Azib:
The Prophet appointed 'Abdullah bin Jubair as the commander of the infantry during the battle of Uhud. They returned defeated, and that is what is meant by:--
"And the Apostle was calling them back in the rear. None remained with the Prophet then, but twelve men."