Chatham had been chosen as the place of meeting with special reference to the effect it might have on the large Negro population resident in the immediate vicinity. There were more Negroes within fifty miles of Chatham than in any other section of Canadian territory and among them were men of intelligence, education and daring, some of them experienced in slave raiding. Brown was justified in expecting help from them. There is also evidence that among the Negroes themselves there existed a secret organization, known under various names, having as its object to assist fugitives and resist their masters. Help from this organization was also expected.[17] Hinton says that Brown "never expected any more aid from them than that which would give a good impetus."[18] John Brown himself is quoted by Realf, one of his associates, as saying that he expected aid from the Negroes generally, both in Canada and the United States,[19] but it must be remembered that his plans called for quality rather than quantity of assistance. A few daring men, planted in the mountains of Virginia, would have accomplished his initial purpose better than a thousand. The real reason why the Canadian Negroes failed to respond in the summer of 1860 when Brown's men were gathering near the boundary line of slavery seems to be that too great a delay followed after the Chatham convention. The convention was held on May 8 and 10, 1858; but Brown did not attack Harper's Ferry until the night of October 16, 1859, nearly a year and a half later. The zeal for action that manifested itself in May, 1858, had cooled off by October, 1859, the magnetic influence of Brown himself had been withdrawn, and the Negroes had entered into new engagements. Frank B. Sanborn says he understood from Brown that he hoped to strike about the middle of May of 1858, that is about a week after the convention or as soon as his forces could gather at the required point.[20] The delay was caused by the partial exposure of Brown's plans to Senator Henry Wilson by Hugh Forbes, who had been close to Brown. Panic seized Brown's chief white supporters in New England, the men who financed his various operations, and they decided that the plans must be changed. Brown was much discouraged by their decision, but being dependent upon them for support in his work he submitted and went west to Kansas. Among his exploits there was the running off of more than a dozen slaves whom he landed safely at Windsor, Canada.