Award-winning historian Cory M. Pfarr joins co-hosts Tom McMillan and John Banks for a conversation about the U.S. Signal Service at Antietam. Plus, he dishes on James Longstreet’s role in the battle — and that carpet-slippers story. Pfarr — who has written extensively about Longstreet — is the author of the 2026 book The Federal Signal Service at Antietam: Stations, Officers and Battlefield Intelligence on America’s Bloodiest Day.