Viswa Singha sought the alliance of tribal (Koch, Garo and Mech) chiefs against the more powerful Baro-Bhuyans and began his campaign around 1509. Successively, he defeated the Bhuyans of Ouguri, Jhargaon, Karnapur, Phulaguri, Bijni and Pandunath (Pandu, in Guwahati). He was particularly stretched by the Bhuyan of Karnapur, and could defeat him only by a stratagem during Bihu. After subjugating the petty rulers, he announced himself the king of Kamata bounded on the east by Barnadi river and on the west by the Karatoya river in the year 1515. He moved his capital from Chikana to Kamatapur (also called Kantapur) which is just a few miles southeast of the present-day Cooch Behar town.