It’s odd to know, as a citizen of your own time, what future historians will argue about it, but not to know what they will say about it—and, even odder, what they ought to say about it. We should, after all, be experts on our own experience; yet we aren’t. In a way, this isn’t surprising. Someone who fought in blue at Antietam would, presumably, be able to tell Civil War historians a thing or two about the face of battle. But, overwhelmed by smoke and noise, a soldier would more likely emerge from the battle simultaneously cursing his time and blessing his luck for surviving the fight, but having no more insight into the course—or the meaning—of it than anyone else.