The number of Muslims in the battle of Badr was 313 while that of Makkan force was ____________
Explanation
All of the clans of the Quraish except the Banu 'Adi quickly assembled an excited army of around 1300 men, 100 horses and a large number of camels. Moving swiftly towards Badr, they passed the valleys of 'Usfan, Qadid and al-Juhfah. At al-Juhfah, another messenger from Abu Sufyan informed them of the safety of their merchandise and wealth. Upon receiving this message, the Makkan army expressed delight and showed a desire to return home. Abu Jahl was not interested in returning and insisted on proceeding to Badr, and holding a feast there to show the Muslims and the surrounding tribes that they were superior. Despite Abu Jahl's threat and insistence, the Banu Zahrah, numbering around 300, broke away from the army and returned to Makkah, on the advice of Al-Akhnas ibn Shurayq