This Washington Post writer seems to be a humorist rather than an editorial writer, but she acquits herself splendidly here, talking about the changing interpretation of Gettysburg’s battle, importance, and even the visitor’s center.
I particularly liked this passage:
This randomness is the part of military history that has always fascinated me. You miss a sunken road on your map, and Waterloo is a defeat instead of a victory. You misplace three cigars with orders wrapped around them, and Antietam suddenly grows more complicated. You shoot at what you take to be an enemy riding in the woods, and you have killed Stonewall Jackson. Hold the heights for an hour longer, for two hours longer, and the course of history shifts.