Robert Stinnett’s book Day of Deceit — and his own primary research upon which his book is based — is a major achievement in getting to the truth about World War II. U.S. Navy code-breaking of Japanese communications, combined with ULTRA, the British program that decoded German ciphers throughout the war, provided the Allies with a stupendous advantage over the Axis — who never suspected their enemy knew what they were going to do before they did it.
Of course the Allies won WW II. How could they lose? Stinnett's revelation does not negate the other things that were required to win. Yet, this huge intelligence advantage may be the main reason the Allies won in 1945. The Allies have never enjoyed such an advantage since and they have not won a war in the past sixty-two years, despite having gigantic advantages in firepower and logistics.
Day of Deceit by Robert Stinnett