Although the transactions with the people of Yathrib had been carried on with profound secrecy, the nature of Mohammed's contract with his new adherents was somehow divulged to the Meccan magnates, and the danger of allowing an implacable enemy to establish himself on the high-road of their north bound caravans flashed upon them. The rule which forbade bloodshed in the sacred city had at last to be suspended; but elaborate precautions were to be taken whereby every tribe (except Mohammed's own clan) should have their share in the guilt, which would thus be spread over the whole community fairly. When the committee appointed to perpetrate the crime reached Mohammed's house, they found that it was too late; Mohammed had already departed, leaving Ali in his bed.
to have been occasioned by the riotous conduct of one of his fol lowers when under the influence of liquor. As the system spread outside of Medina both conversion to Islam and persistence therein were reduced to simple tests; the pronunciation of the double formula of belief in Allah and Mohammed was sufficient to indicate conversion, whilst payment of an income-tax was evi dence of loyalty.
The Campaigns of Mohammed.—The industries in which the Meccan refugees had been engaged were not of a sort which they could exercise at Medina, and hence a fresh source of revenue was sought in the attacking of Meccan caravans. After a year of futile attempts, Mohammed resolved to send an expedition to attack a caravan at the beginning of the sacred month of Rajab, a season when raiding was unknown among the Arabs. The violation of the sacred month seems to have caused con siderable scandal in Arabia, but led to no serious consequence; on the other hand the shedding of blood created a feud between the Meccans and the refugees, whom they declined to identify with the people of Medina. Some months later another attack for which the Prophet had organized a party of some 30o men led to the battle of Badr (Ramadan 19, A.H. 2, usually made to synchronize with March 17, 624) in which the Meccans number ing about a thousand were badly defeated. The day is called in the Koran by a Syriac expression the "Day of Deliverance," and both for internal and external politics was of incalculable advantage to Islam, whilst Mohammed in the popularity acquired by his victory was able to strike forcibly at his enemies in Medina.
The defeat at Badr naturally led to efforts on the part of the Meccans to avenge their dead and besides to secure the corn merce by which they lived, from an enemy who was gradually getting all the seaboard that lay between Jeddah and Yanbo within his sphere of influence ; and the year after Badr (A.H. 3), when Abu Sofian led a force of some 3,00o men against Medina itself, part of it was under Khalid b. al-Walid, one of the greatest of Arab captains, afterwards conqueror of Syria. A battle was fought under Mt. Uhud (or Ohod), north-west of Medina, wherein Mohammed's forces were defeated. The Meccans considering their task finished when they had killed as many as those who had fallen at Badr on their own side, instead of pursuing their victory went home. Two years later, they, with their allies, the tribes Fazarah, Asad, Murrah, etc., to the number, it is said, of ro,000, attempted to stamp out Islam, but Mohammed resorted to the expedient of defending his city by a trench and employed agents to sow dissension among the confederates. After a brief stay and scarcely striking a blow, the confederacy dispersed.