...ffort to win peace by other means than by conquering it, had been tried in vain. That effort was a notable one, as the outline here given will show. We have seen how futile were the missions of Mr. Greeley to Niagara, and of Messrs. Jaques and Gillmore to Richmond, the previous summer, in the interest of peace. A few months later, Francis P. Blair, senior, a venerable politician of Maryland, who had g...