sentences:  For example, the Battle of Badr, one of the most important in the early history of Islam, was opened by three champions of the Islamic side (Ali, Ubaydah, and Hamzah) stepping forward, engaging and defeating three of the then-Pagan Meccans, although Ubaydah was mortally wounded.This result of the three single combats was considered to have substantially contributed to the Muslim victory in the overall battle which followed.Duels were also part of other battles at the time of Muhammad, such as the battle of Uhud, battle of the Trench and the battle of Khaybar.