[1][2][4][6][7][8][9][10][11][12][13] He was ordained along with Judson, Mills, Newell, Nott, and Rice on 6 February 1812 by the ABCFM at Tabernacle church, Salem, Massachusetts.
Judson and Newell reached Calcutta (present Kolkata) on 17 June 1812, while Hall and others on 8 August 1812—Mills remained in United States, apparently, to promote and oversee the cause to which he was committed.
Under these circumstances—Mr.& Mrs.Samuel Newell embarked for the Isle of France, now Mauritius—Judson and Rice got baptized and resigned ABCFM that ultimately resulted in the formation of a Baptist Board for Foreign Missions in the United States—Hall and Nott, though engaged their passage to Isle of France, an unexpected detention of their vessel made them to change their plans to go Ceylon, now Sri Lanka; however, the arrival of Evan Napean, who was friend of missions and a vice-president of the British and Foreign Bible Society, as the governor of Bombay Presidency opened a better prospect for them.
When Americans (Hall and Nott) arrived, Mahrattas, originally an obscure piratical race[citation needed], were dominant in Bombay in the early eighteenth century.
Americans were the first to go in among them— Unlike Tamil people in South India and northern districts of Ceylon, no preparatory work had been done for Bombay Mission, except merely that of conquest by a Christian power.
After Nott relinquished his labors due to ill-health and reverted to United States, Hall and Newell continued the missionary work.
Having already caught up with Cholera, he died on 20 March 1826 at Dodi Dapur, near Nasik, Maharashtra, India, after thirteen years of missionary work between 1813 and 1826.
He wrote The Conversion of the World, or the Claims of the Six Hundred Millions in 1818, along with Samuel Newell—with this publication, Hall and Newell "proposed a strategy whereby 30,000 missionaries could reach every person on earth."
[12]In October 1826, he published Appeal to American Christians on behalf of the twelve millions speaking the Mahratta language in Missionary Herald.