Samuel J. Mills, when a student in Williams College, gathered about him a group of fellow students, all feeling the burden of the great heathen world. One day in 1806 four of them, overtaken by a thunderstorm, took refuge in the shelter of a haystack. They passed the time in prayer for the salvation of the world, and resolved, if opportunity offered, to go themselves as missionaries. This "haystack prayer meeting" has become historic.

These young men went later to Andover Theological Seminary, where Adoniram Judson joined them. Four of these sent a petition to the Massachusetts Congregational Association at Bradford, June 29, 1810, offering themselves as missionaries and asking whether they might expect support from a society in this country, or whether they must apply to a British society. In response to this appeal the American Board of Commissioners for Foreign Missions was formed.

When a charter for the Board was applied for, an unbelieving soul objected upon the floor of the legislature, alleging in opposition to the petition that the country contained so limited a supply of Christianity that none could be spared for export, but was aptly reminded by another, who was blessed with a more optimistic make, that this was a commodity such that the more of it was sent abroad the more remained at home. There was much perplexity concerning plans and finances, so Judson was dispatched to England to confer with the London Society as to the feasibility of the two organizations cooperating in sending and sustaining the candidates, but this scheme came to nothing. At last sufficient money was raised, and in February, 1812, the first missionaries of the American Board sailed for the Orient. Mr. Judson was accompanied by his wife, having married Ann Hasseltine shortly before sailing.

On the long voyage out, in some way Mr. and Mrs. Judson and Mr. Rice were led to revise their convictions with reference to the proper mode of baptism, reached the conclusion that only immersion was valid, and were reabptized by Carey soon after their arrival in Calcutta. This step necessarily sundered their connection with the body which had sent them forth, and left them wholly destitute of support. Mr. Rice returned to America to report this condition of affairs to the Baptist brethren. They looked upon the situation as the result of an act of Providence, and eagerly planned to accept the responsibility thrust upon them. Accordingly the Baptist Missionary Union was formed. So Mr. Judson was the occasion of the organization of two great missionary societies.