 The Ahoms migrated from present-day Myanmar to the Brahmaputra valley in the 13th-century.They settled in with the locals initially and created a new state; and in the 16th-century they vastly expanded their power and territory by occupying the Chutiya kingdom in Upper Assam, removing the Baro-Bhuyan confederacy in Nagaon and Darrang, and pushing the Dimasa kingdom further south.As the kingdom pushed west it came under attack from Turkic and Afghan rulers; and on one occasion the Ahoms general Ton Kham Borgohain pursued retreating invaders through a nascent Koch kingdom and reached the Karatoya river—and since then they began to see themselves as the rightful heir of the erstwhile Kamarupa kingdom.