- Be fore his death Omar had nominated six of the leading Mohajir (Emigrants) who should choose the caliph from among themselves - Othman, Ali, Zobair, Talha, Sa`d b.
The opposition was headed by Ali, Zobair, Talha, both as leading men among the Emigrants and as disappointed candidates for the Caliphate.
But, that the spiritual nobility was fighting not for principle but for personal advantage was as apparent in Ali's hostilities against Zobair and Talha as in that of the Abbasids against the followers of Ali.
The mass of the mutineers summoned Ali to the Caliphate, and compelled even Talha and Zobair to do him homage.
The new caliph, however, found means of disposing of their opposition, and at the battle of the Camel, fought at Basra in November 656, Talha and Zobair were slain, and Ayesha was taken prisoner.
Almost the first act of his reign was the suppression of a rebellion under Talha and Zobair, who were instigated by Ayesha, Mahomet's widow, a bitter enemy of Ali, and one of the chief hindrances to his advancement to the caliphate.