Dorothea Barron got a preview of the D-Day invasion from a watchtower on the coast of Scotland.
During the spring and summer of 1943, she and her colleagues kept watch over the troops as they tested the prototypes for two portable harbors that would be used at Normandy to ease the delivery of men and equipment to the battlefield. Whenever someone got into trouble, Barron would unfurl her semaphore flags and signal for help.
