Canada, occupying the geographical position and belonging to another nation as it does, has been ever since this war broke out, the rendezvous of thousands upon thousands of the vagabond and criminal population of the United States, together with the rebels and refugees, until its population far exceeds what it had in 1860; almost every business occupation is crowded to such an extent that it is almost impossible to obtain employment of any kind, many persons being obliged to keep from starving by begging, for their food, and the clothes they wear upon their backs. Some of this refugee population have means, others are supplied by their friends and families at home; but by far the greater number are without any occupation or visible means of support, habitué of the gambling hells, drinking saloons, &c., in favor of any crime or villainy to supply their depleted purses, and furnish them with the means of living at ease and idleness. Under such circumstances and among such a class of population, is it anything strange, that the robbery of banks, the pillaging of the inhabitants of the Northern border, that raids with all the necessary plundering and so forth, found plenty of advocates and supporters, and when the time arrived to carry them into execution, plenty of desperadoes, fit tools for such infamous projects. The great difficulty in Canada was not in getting enough of these men to participate in matters of this kind; but to prevent too many of them from knowing of them, so that there would be a smaller number among whom to divide the spoils and plunder thus obtained, so that the chief difficulty lay in getting together just enough of the most desperate characters to carry out an expedition. During the Chicago Democratic Convention the efforts of the rebels were not confined alone to Camp Douglas; but simultaneously with their efforts in Chicago, they were to make an attempt to capture the United States Steamer Michigan, carrying eighteen guns, stationed on Lake Erie, the steamer permitted by the treaty between the United States and Great Britain, for the better protection of rebel prisoners confined at Johnston's Island.