Slavery in the United States was abolished by force of circumstances. The appeal to arms in April, 1861, was made by the North for the purpose of saving the Union, but only within a few months after the breaking out of hostilities "what shall we do with the slaves within our lines" was the cry heard from all sections of the invaded territory. Deserted by their masters or endeavoring to obtain freedom, the Negroes came into the Union camps in such large numbers that humanitarian as well as military reasons demanded that something be done to change their status and alleviate their physical suffering.[2] In the absence of a uniform national policy on the matter, the several commanding generals settled the question according to their own notions. Butler, at Fortress Monroe, for example, refused to return the group of fugitive slaves and cleverly styled them "contraband of war." It was under these circumstances that voluntary benevolent associations or freedmen's aid societies sprang up in quick succession all over the North as agencies first to relieve physical suffering and finally to administer to the religious and educational needs of the blacks and white refugees. Missionary efforts were rapidly pushed by them to all Confederate States just as fast as the Union armies advanced into the invaded territory. These private philanthropic efforts which began in 1861 finally led toward the close of the war to the establishment by the United States Government of the Bureau of Refugees, Freedmen and Abandoned Lands--an agency which carried on the work already begun by the societies and at the same time cooperated with them until changed conditions were reached about 1870. The military event in South Carolina which called forth immediate relief was the capture of Hilton Head and the adjacent sea islands on November 7, 1861, by Commodore Dupont and General T. W. Sherman.[3] The agencies formed to succor the blacks on these islands were the New England Freedmen's Aid Society, the New York National Freedmen's Relief Association, and the Pennsylvania Freedmen's Relief Association. These several bodies were non-sectarian in character. Cooperating with them were some regular church organizations. At some time during the seven years existence of the Freedmen's Bureau it embraced a six-fold program: (1) distributing rations and medical supplies; (2) establishing schools and aiding benevolent associations; (3) regulating labor contracts; (4) taking charge of confiscated lands; (5) administering justice in cases where blacks were concerned, and (6) the payment of bounties to soldiers. The societies likewise exercised various physical functions, but it is only the educational activities of all parties concerned that are of primary interest here.