... re-echoing from the heights of Round Top, might have been heard and heeded around the walls of Washingtoi, Baltimore, and Philadelphia. There is a ghastliness about that picture of the struggle at Gettysburg , that the blood of the heroes who perished there serves but to increase; and over that splendid scene of human courage and human sacrifice, there arises like the ghost of Banquo at Macbeth's banquet,...