My son-in-law and I explored the Antietam Battlefield yesterday. That site of the bloodiest day ever in American history, with 23,000 casualties, was amazing, humbling, sad, thrilling, inspiring. We read Jeff Shaara’s account of the battle in his guide to Civil War battlefields, so we understood about the corn field, the sunken road, and Burnside’s bridge, still standing and upon which we walked, imagining the carnage it held (as well