From the mid-19th century onwards, indigenously led conversion movements drew scores of separate tribal (adivāsi) peoples toward Christian faith in all of the eastern mountain frontiers. It is significant that, as a consequence, adivāsi populations in the seven states that now surround Assam Valley are predominantly Christian. Moreover, modern education and literacy in Roman script has not only given them easy cultural access to all of India but to the entire anglophone world. This chapter examines the Nagas, with the hope that this can serve as a representative sample or template for the understanding of other adivāsi tribes. It also briefly summarizes how the Gospel came to other adivāsi peoples.