The Ultra Secret Author:F.W. Winterbotham In 1940, the German Air Force bombed Coventry, England, demolishing the city and causing atrocious civilian casualties. Yet the British under Winston Churchill could have saved Coventry, for they had advance warning of the German air strike. Instead they chose to sacrifice these lives and many others at different times and places rather than rev... more »eal to Hitler and the German High Command that the Allies had cracked the German "unbreakable" code, and now knew the most secret enemy orders and plans sometimes even before the German field commanders. For thirty-five years, Ultra has remained a closely guarded secret. Now it is revealed by the man who ran the whole incredible momentous operation. Now for the first time we can see how World War II was really won.