Just as an FYI, the Enigma decoding effort was not the war-winning codebreak at Bletchley. Enigma gave access to very tactical, short duration information, lik

Just as an FYI, the Enigma decoding effort was not the war-winning codebreak at Bletchley. Enigma gave access to very tactical, short duration information, like the location of subs and their intended movements over the next few days, or the movement of a land unit, again on a timescale of days. Admittedly Enigma was so thoroughly broken that the UK was able to decrypt huge numbers of communications, and the aggregate did give some indications as to higher-level strategic planning. Nevertheless, the main game at Bletchley was Colossus (https://en.wikipedia.org/wiki/Colossus_computer https://en.wikipedia.org/wiki/Colossus_computer) which allowed the decryption of high level planning communications between German High Command and the government. By main game, I mean that it was the work on Colossus which created the first machines recognisable as computers. This was the codebreak that truly gave the Allies the ability to outmanoeuvre the Germans at a strategic level. There were no German strategic victories once Colossus came on line in late 1943 (the last substantial German victory in the war was https://en.wikipedia.org/wiki/Third_Battle_of_Kharkov#Manstein.27s_counterattack https://en.wikipedia.org/wiki/Third_Battle_of_Kharkov#Manste... in March 1943), compared to numerous Eastern front victories after the Allies started to successfully decrypt Enigma. Of course we as geeks tend to overestimate the effects of successfully breaking codes. The results are not always positive - for example Rommel's offensive in Africa originally succeeded because Enigma intercepts indicated that he had been told to sit tight, but Rommel decided by himself to launch an offensive. The English were caught flat-footed, and very nearly lost North Africa as a result (https://en.wikipedia.org/wiki/North_African_campaign#Allies https://en.wikipedia.org/wiki/North_African_campaign#Allies), with only a well-fought defensive action by the Australians stationed in Tobruk saving the day.