Historians estimate that more than 56,000 Americans died in prison camps during the Civil War. That's a casualty figure that is far greater than any single battle. The South's most famous prison was at Andersonville in Georgia. Conditions there were horrible; the food was scarce and often rancid. Nearly 29 percent of all prisoners detained at Andersonville died before the end of the war. Singer Dave Alvin wrote a song about it after he discovered that one of his relatives died there. WUNC's Eric Hodge spoke with Alvin for our series North Carolina Voices: The Civil War.