The author here looks at the fragmentation of the Abbasid Caliphate based in Iraq, and the Fatimids, Buwayhids, Ghaznawids and other principalities that emerged... » 

The author here looks at the fragmentation of the Abbasid Caliphate based in Iraq, and the Fatimids, Buwayhids, Ghaznawids and other principalities that emerged from the wrecked Abbasid state. More advanced than any other medieval military power, the Caliphal armies were a potent force. «