In 1340 Mas'ud moved against the Ja'un-i Qurban under Arghun Shah; the latter was forced to abandon Nishapur and retreat to Tus. The Sarbadars continued to mint coins in Togha Temur's name, in the hope that he would ignore this move as he was campaigning in the west again at this time. The khan, however, moved against them; his forces were destroyed, and while fleeing to Mazandaran several important figures such as 'Ala' al-Din (formerly in charge of Sabzavar), 'Abd-Allah, and Togha's own brother 'Ali Ke'un were killed. The Sarbadars gained control of Jajarm, Damghan and Simnan, along with Togha's capital of Gurgan. Mas'ud and Hasan Juri, however, soon came into disagreement over several issues. Mas'ud, following the defeat of Togha Temur, gained a new suzerain in the form of Hasan Kucek of the Chobanids, as well as the latter's puppet khan Sulaiman. Mas'ud considered the move necessary; with the conquest of Simnan, the Chobanids were now neighbors. Since the Chobanids were Sunnis, however, this doubtless did not go over well with Mas'ud's co-ruler.