Retribution for the Killing of a Muslim Envoy
When the Prophet and his followers returned to Medina, they arranged an expedition to exact retribution from the Ghassanite prince who had killed the Muslim envoy. A force of three thousand men, under the Prophet's adopted son Zaid, was sent to take reparation from the offending tribe.
Khalid Ibn Al-Walid was one of the generals chosen for the expedition. When they reached the neighborhood of Muta, a village to the southeast of the Dead Sea, they met with an overwhelming force of Arabs and Romans who were assembled to oppose them. The Muslims, however, resolved resolutely to push forward. Their courage was of no avail and they suffered great losses. In this battle Zaid and Jafar, a cousin of the Prophet, and several other notables were killed. Khalid Ibn Al-Walid, by a series of maneuvers, succeeded in drawing off the army and conducting it without further loses to Medina. A month later, however, 'Amr Ibn Al-As marched unopposed through the lands of the hostile tribes, received their submission, and restored the prestige of Islam on the Syrian frontier.

The Muslims Decide to Conquer Mecca
About the end of the seventh year of the hijrah, the Quraish and their allies, the Bani Bakr, violated the terms of the peace concluded at Hudaibiya by attacking the Bani Khuzaah, who were in alliance with the Muslims. The Bani Khuzaah appealed to the Prophet for help and protection. The Prophet determined to make a stop to the reign of injustice and oppression which had lasted so long at Mecca. He immediately gathered ten thousand men to march against the idolaters and set out on our 1 January, 630.

Abu Sufyan Accepts Islam
After eight days the Muslim army halted and alighted at Marr Az-Zahran, a day's journey from Mecca. On the night of their arrival, Abu Sufyan, who was delegated by the Quraish to ask the Prophet to abandon his project, presented himself and besought an interview. In the morning it was granted. "Has the time not come, 0 Abu Sufyan," said the Prophet, "for you to acknowledge that there is no deity save Allah and that I am His Messenger?" Abu Sufyan, after hesitating for a while, pronounced the prescribed formula of belief and adopted Islam. He was then sent back to prepare the city for the Prophet's approach.