The Battle of Badr , was fought March 17 , 624 CE of western Arabia ( present-day Saudi Arabia ) . It was a key battle in the early days of Islam and a turning point in Muhammad 's struggle with his opponents among the Quraysh in Mecca . The Battle of Badr , fought March 13 , 624 AD ( 17 Ramadan 2 AH in the Islamic calendar ) Hejaz region of western Arabia ( present-day Saudi Arabia ) , was a key battle in the early days of Islam and a turning point in Muhammad 's struggle with his opponents among the Quraish in Mecca .