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For readers of The Making of the Atomic Bomb and Code Girls, who want stories about the tech behind military successes and the maverick groups that generate historic innovations This is the previously classified story of one group of scientific researchers - men and women - who exposed themselves to extraordinary risks to make D-Day a success.. On the beaches of Normandy, two summers before D-Day, the Allies attempted an all but forgotten landing. Of the nearly seven thousand Allied troops sent ashore, only a few hundred survived the terrible massacre, and the reason for the debacle was a lack of reconnaissance. The shore turned out to be impassable to tanks. The Nazis had hidden obstacles in unexpected places. The fortifications were more numerous - and deadly - than imagined.