The collapse of John Brown's great adventure at Harper's Ferry furnished complete proof to the South of Canada's relation to that event. The seizure of his papers and all that they told, the evidence at the trial at Charlestown and the evidence secured by the Senatorial Committee which investigated the affair, all confirmed the suspicion that in the British provinces to the north there was extensive plotting against the slavery system. The Senatorial Committee declared in its findings that the proceedings at Chatham had had as their object "to subvert the government of one or more of the States, and, of course, to that extent the government of the United States."[13] Questions were asked of the witnesses before the investigating committee which showed that in the minds of the members of that committee there was a distinctly Canadian end to the Harper's Ferry tragedy.[14] Their suspicions may have been further confirmed by the fact that Brown's New England confederates, Sanborn, Stearns and Howe, all fled to Canada immediately after the raid. In the actual events at Harper's Ferry the assistance given by Canada was small. Of the men who marched out with Brown on that fateful October night only one could in any way be described as a Canadian. This was Osborn Perry Anderson, a Negro born free in Pennsylvania. He was working as a printer in Chatham at the time of the convention and threw in his lot with Brown. He was one of those who escaped at Harper's Ferry. He later wrote an account of the affair, served during the latter part of the Civil War in the northern army and died at Washington in 1871. He is described by Hinton as "well educated, a man of natural dignity, modest, simple in character and manners."[15] There naturally arises the question, why was the aid given John Brown by the Canadian Negroes so meagre? That Brown had counted on considerable help in his enterprise from the men who joined with him in drafting the "provisional constitution" is certain. John Edwin Cook, one of Brown's close associates, declared in his confession made after Harper's Ferry, that "men and money had both been promised from Chatham and other parts of Canada."[16] Yet, apart from Anderson, a Negro, only one other Canadian of either color seems to have had any share in the raid. Dr. Alexander Milton Ross went to Richmond, Virginia, before the blow was struck, as he had promised Brown he would do, and was there when word came of its unhappy ending. Brown evidently counted on Ross being able to keep him in touch with developments at the capital of Virginia.