FN David’s career trajectory at University College London in the 1930’s was interrupted when she was drafted in 1939 to provide statistical expertise to the British World War II effort. She was ultimately assigned to the Special Section 8 of the Ministry of Home Security. In all she gave six years to the cause until the war in Europe ended in 1945. Years later she expressed the feeling that her time was wasted, but evidence of her work for the war effort indicates that it clearly was not. This talk will draw from previously classified documents that David wrote about bombing studies, land mines studies, and the use of bomb shelters by British civilians. It will put her work into the greater context of the Allied war strategy and illuminate the importance of her statistical contributions.