Koch–Ahom conflicts
The Koch–Ahom conflicts (1532–1571) refer to the diplomatic, strategic and military relationships between the Koch and the Ahom kingdoms over the control of the Brahmaputra Valley. Though an initial contact between the Ahoms and Koch occurred during Biswa Singha's reign, the relationship became belligerent with Nara Narayana ascending to power and consolidating his hold over the western portion of Assam; and it ended with the failure of Chilarai's campaign against Sulaiman Karrani.