Originally posted by Heyesey
The Enigma code was broken chiefly by a group working out of Bletchley Park, in which Alan Turing played a major role. I don't know, without trawling through the net to find the stuff, exactly how many non-British persons were involved: there almost certainly were some, but it was a mostly British effort. The film, I gather, pulls the same trick as U571, The Thin Red Line and most other American WWII films of pretending that only Americans were involved on the Allied side.
In defence of Hollywood, I point out that most British WWII films make it look like only British soldiers were involved on the Allied side
It's just that Hollywood films get seen by a far bigger audience and therefore mislead more people, and draw more criticism for doing so.
The Poles made breakthroughs into the code in the 30's and intercepted an enigma machine before war broke out. It was mailed to the German embassy (mailed

) they held it for a weekend and copied it.
With respect to the Poles, and Americans who worked on the project, the overwhelming work, including breaking the code after the addition of an extra wheel, was done by the Brits at Bletchley.
As for Hollywood, there is no excuse in making up stories as ridiculous as U571, and now this one about enigma. What's the point, the truth is usually more exciting.
What was wrong with Thin Red Line? It was set in Guadalcanal after all.