Once upon a time, Americans recognized the unpleasant fact that, as Sherman said, "war is hell," and they acted accordingly, accepting the pain and the losses as the price that had to be paid for victory. Americans understood it during the Revolutionary War, when it took six long years of losing battle after battle to achieve victory. Facing the mightiest army on the face of the earth, lacking the most rudimentary tools of war, even going shoeless in the winter snow, often hungry, they endured – and by enduring they triumphed. We don't have to go that far back to...