The revolution of 750 abolished these
distinctions; under the early Abbasids, three equal corps are
recognized in the Caliph’s forces, the northern and southern Arabs
and the Khurasanians; the influence of the great Arab cantonments
of Kufa and Basra declined, and the Bedouin element in the army
was rapidly diluted by the admission of mawali of all ranks into
the military establishment