The group sailed up the Brahmaputra river and arrived in Sadiya on 23 March 1836, and there confronted them with dense jungles, hostile tribals and rugged hills.
Yet, believing they had been led to a fruitful place they began to learn Assamese language, set up their printing press, and gave themselves to the task of translating, publishing and teaching.
Beginning from Sadiya, the work moved down the Brahmaputra river to the leading towns of Assam plains, for example, Sibsagar, Nowgong and Gauhati.
The work among the (Mikirs) Karbis was started quite early but it did not gain much progress because of the influence of Hinduism among the people.
The field work in North-East India was largely the responsibility of the American Baptist Mission until 1950.
In fact, the Mission could not handle the full obligation of the area and so in the 1940 the area on the North Bank of Brahmaputra river was handed over to the care of the Australian Baptist Mission (for Goalpara district) and to the General Baptist Conference (for Darrang and North Lakhimpur districts).
From the early days of the missions in North-East India there were joint meetings of missionaries and nationals to plan the work.
Later the name was changed to CBCAM, and finally, the Council of Baptist Churches in North-East India on geographical grounds.
So since the year 1950 the field works has been brought under the ministry of the Council of Baptist Churches in North East India (CBCNEI).