In April 623, the Islamic Prophet Muhammad sent Ubaydah ibn al-Harith with a party of sixty armed Muhajirun (Muslim exiles in Medina) to the valley of Rabigh, in modern-day Saudi Arabia. They expected to intercept a Quraysh caravan that was returning from Syria under the protection of Abu Sufyan ibn Harb and 200 armed riders. The Muslim party travelled as far as the wells at Thanyat al-Murra, where Sa`d ibn Abi Waqqas shot an arrow at the Quraysh. This is known as the first arrow of Islam. Despite this surprise attack, "they did not unsheathe a sword or approach one another," and the Muslims returned empty-handed; however, two Meccans traders left their caravan, became Muslim, and went with the expedition back to Medina.