The Iraq theater was one of two major areas of operations during the Zanj Rebellion, the other being the neighboring province of al-Ahwaz. The revolt, which began in September 869 in southern Iraq, was initially limited to the region around the port city of Basra, as well as the southern districts of al-Ahwaz to the east. Efforts by the Abbasid caliphs in Samarra to crush the rebellion proved ineffectual, and several towns and villages were occupied or sacked. Basra itself fell in September 871 following an extended blockade, after which the city was burned and its inhabitants massacred. A retaliatory campaign undertaken by the caliphal regent Abu Ahmad ibn al-Mutawakkil (known by his honorific of al-Muwaffaq) against the rebels in 872 ended in failure, and the Zanj remained on the offensi