The Assam forces, under Lachit Borphukan, unable to match the Mughals on land, were able to win the decisive Battle of Saraighat on the Brahmaputra river which forced Ram Singh to retreat back to Mughal territory.
The Battle of Saraighat was fought in 1671 between the Mughal empire (led by the Kachwaha king, Raja Ramsingh I), and the Ahom Kingdom (led by Lachit Borphukan) on the Brahmaputra river at Saraighat, now in Guwahati.