Over 1,400 Chicago companies converted almost overnight from peacetime to war production in World War II. Along with the first major introduction of women into the labor force, it became the most successful mobilization of brains and muscles in American history. With rare images, see the same locales as they were and as they are, including the largest war factory ever built. Presented by Elmhurst historian Jerome M. O'Connor, the 2001 U.S. Naval Institute's Author of the Year and current author of The Hidden Places of World War II.