In the second year after hijrah during Ramadan, the Prophet صلى الله عليه وسلم left out with three hundred plus men from the believers in pursuit of a caravan of the Quraish returning from Syria, however Abu Sufan diverted off route and shaytan provoked the Quraish to come and fight the believers. Both the believers and the Quraish met at Badr and this was the big battle of Badr that was also referred to as ‘yawmul-furqan’ (the day of criterion).
When the two armies encountered each other, the Prophet صلى الله عليه وسلم supplicated in humility to Allah, so Allah aided the believers with Angels who fought alongside them, Allah granted them victory over the disbelievers raising the word of Allah. During this battle seventy of the disbelievers were killed and fourteen of the believers were martyred.