 Sarbananda became a Muslim, changing his name to Sarwar, and worked as a minister under the Sultan of Bengal.Under the instructions of Sultan Alauddin Husain Shah, Sarwar went to the Pratapgarh Kingdom to negotiate with Sultan Muhammad Bazid to return Sylhet to the Bengal Sultanate.After being rejected by Bazid, Sarwar defeated him in a war also fighting Bazid's allies, the Zamindars of Kanihati and of Ita.