Following the conquest of Noakhali and Chittagong by the Arakanese king Min Phalaung, Rajdhar, commanding a large contingent, was sent into the occupied regions to drive out the invaders. The army landed in Chittagong and Rajdhar, alongside his brother Amaradurlabha and the generals Chandradarpa-Narayan and Chattrajit Najir, led the capture of six enemy camps successively before halting at Ramu. The Arakanese, following a failed retaliatory assault, blockaded the troops, resulting in the latter's supplies soon dwindling. Additionally, the Portuguese soldiers who formed part of the Tripura army were enticed to desert, turning their camps over to the enemy. This forced the Tripuri to begin retreating back to Chittagong, though at the Karnaphuli River, they were attacked and defeated by the Arakanese, resulting in heavy casualties. However, upon reaching Chittagong, Rajdhar had the army reorganised and launched a counter-assault, capturing seven of the enemy fortresses and forcing their retreat.