If you didn't sleep through U.S. history class, you've heard of Pickett's Charge. If you've seen the movie Gettysburg, you're familiar with Little Round Top. If you've been to the battlefield, you've seen the Wheatfield. But do you know about the ten or so Confederates buried by accident in Gettysburg National Cemetery? Or about the Union general whose embezzling ways kept his bust from being displayed on his brigade's memorial? Or how that...