Who doubts for a moment that a thousand mounted men, acting with the freedom which characterized the movements of the detachment of Garibaldi in the Italian war, acting with the authorization of the Government, actuated by the spirit of a John Brown or a Nat Turner, sent, or rather let go, into the mountains of Virginia, North Carolina, or Georgia, with the authority to assemble and arm the slaves, retreating whenever assailed to the fastnesses of the mountains, would cause more terror in those States; would do more, in a word, toward the actual conquest in three months' time of those rebel commonwealths, than fifty or a hundred times their number organized in the regular forms of modern warfare, operating against the whites only, and half-committed to the cooeperative protection of the institution of slavery, would accomplish in a year? Who doubts for a moment that, if the South could find a like vulnerable point in the openings of our armor, she would make, with no hesitation, the most fearful and tremendous use of her advantage? The whole North is aware of its possession, in its own hands, of this immense engine of destructive power over its enemy. The whole civilized world stands by, beholding us possessed of it, and expecting, as a simple matter of course, that we shall not fail to employ it--standing by indeed, perplexed and confused at the seeming lack of any significance in the war itself, unless we make use of the power at our command in this fortuitous struggle, not only to inflict the greatest injury upon our enemy, but to extinguish forever the cause of the whole strife. Still we forbear to make the most efficient use of our advantage. We for a long time embarrassed and partially crippled ourselves in all our movements by an almost unconscious sense of responsibility for the protection of this very institution of slavery from the disastrous consequences which were liable to fall upon it as the results of the war.