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Our memories of D-Day usually center on the courage and grit of the infantrymen who stormed the Normandy beaches under German fire. We don't talk much about the weatherman. But without Group Captain James Stagg's forecast, there would have been few heroes to remember from June 6, 1944. In this episode, historian William Hitchcock discusses the riveting new film "Pressure," about the excruciating hours before General Eisenhower greenlit Operation Overlord.

Audio excerpts of "Pressure" are from Focus Features.

Recommended reading:

The Bitter Road to Freedom: A New History of the Liberation of Europe by William Hitchcock