“What he wanted was to make his proclamation as effective as possible in the event of such a peace. He said, in a regretful tone, 'The slaves are not coming so rapidly and so numerously to us as I had hoped'. I replied that the slaveholders knew how to keep such things from their slaves, and probably very few knew of his proclamation. 'Well', he said, 'I want you to set about devising some means of making them acquainted with it, and for bringing them into our lines'. He spoke with great earnestness and much solicitude, and seemed troubled by the attitude of Mr. Greeley, and the growing impatience there was being manifested through the North at the war. He said he was being accused of protracting the war beyond its legitimate object, and of failing to make peace when he might have done so to advantage. He was afraid of what might come of all these complaints, but was persuaded that no solid and lasting peace could come short of absolute submission on the part of the rebels, and he was not for giving them rest by futile conferences at Niagara Falls, or elsewhere, with unauthorized persons. He saw the danger of premature peace, and, like a thoughtful and sagacious man as he was, he wished to provide means of rendering such consummation as harmless as possible. I was the more impressed by this benevolent consideration because he before said, in answer to the peace clamor, that his object was to save the Union, and to do so with or without slavery. What he said on this day showed a deeper moral conviction against slavery than I had ever seen before in anything spoken or written by him. I listened with the deepest interest and profoundest satisfaction, and, at his suggestion, agreed to undertake the organizing a band of scouts, composed of colored men, whose business should be somewhat after the original plan of John Brown, to go into the rebel States, beyond the lines of our armies, and carry the news of emancipation, and urge the slaves to come within our boundaries.”

Source: 1880s, Life and Times of Frederick Douglass (1881), pp. 434–435.