Although the Brits did superb work at Bletchley, much of the early efforts at cracking Enigma were done by Polish cryptographers, in the months before the Nazi blitzkreig. Several of them escaped, and their work was turned over to the Brits at the embassy in Paris..The Poles have never been credited for their ground breaking work..
There’s a LOT of things the Poles didn’t get credit for.
Indeed. See “Enigma: How The Poles Broke The Nazi Code,” by Wladyslaw Kozaczuk and Jerzy Straszak, Hippocrene Books, 2004.
Of course one should also remember Alan Turing, and his pioneering cryptanalytical work at Bletchley Park. There, he improved on the Polish Bomba Kryptolgiczna, and made at least four additional significant advances in code breaking. Dr. Turing was rewarded for his innovative patriotic contributions with a criminal prosecution, and conviction for gross indecency, based on a homosexual relationship.
The Poles in recent years have certainly received their rightful praise, albeit too long in the making.
And Enigma has overshadowed other as important British codebreaking of WW2: other German codes, Italian codes and Japanese codes.