To the east, Ahnaf ibn Qais, chief of Banu Tamim and a veteran commander who conquered Shustar earlier, launched a series of further military expansions by further mauling Yazdegerd III near Oxus River in Turkmenistan and later crushing a military coalition of Sassanid loyalists and Hephthalite Empire in the Siege of Herat. Later, the governor of Basra, Abdullah ibn Aamir also led a number of successful campaigns, ranging from the suppression of revolts in Fars, Kerman, Sistan, and Khorasan, to the opening of new fronts for conquest in Transoxiana and Afghanistan.