Arghun started an open rebellion upon his return from Baghdad to Khorasan in 1283 to gain allegiance of minor nobles and amirs. Tekuder's next step was to send Alinaq with 15.000 men against Arghun on 29 January, while ilkhan himself followed Alinaq on 26 April from his main army composed of Armenians and Georgians in addition to Mongols stationed in Mughan plain near Bilasuvar. Arghun prevailed on Alinaq in battle on 4 May south to Qazvin but nevertheless retreated to his lands in Khorasan. Ala ud-Daula Simnani, future sufi saint of Kubrawiya order also fought in Arghun's army during this battle. Arghun tried to make truce on halfway, which Ahmad against advices of his councillors, refused it. Another embassy sent by Arghun, this time led by his son Ghazan arrived at Tekuder's camp near Semnan on 31 May. Embassy was a success, as Ahmad accepted truce on condition if Arghun sends his brother Gaykhatu as a hostage. Arghun agreed to terms and sent his brother accompanied by two amirs, including Nawruz to custody of Buqa, then most senior of Tekuder's commanders on 13 or 28 June. Buqa in turn handed over him to Ahmad who put Gaykhatu in Tödai Khatun's encampment. Despite this, Tekuder continued hostilities and kept advancing on Arghun. This made Buqa to harbor resentment towards Tekuder and grow more sympathetic to Arghun. On the other hand, he lost Tekuder's favor who started to invest his trust in Aq Buqa, another Jalair general.