[quote=jimbuna]
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How long did it take them to begin realising that most convoy reports still amounted to wild goose chases because the convoy changed course after it was discovered.....or that their enigma code had been compromised ? :hmm:
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According to Clay Blair they suspected it at least a couple of times: Donitz ordered a special commision to investigate if Enigma had been broken on several occasions. Each time they reassured BDU that all was well....(there was also some politics involved in the whole Enigma system that left this as the only possible answer).
The combination of being able to read Enigma and the DF-ing (HuffDuff) of the heavy chatter needed by U-Boats to coordinate their Wolfpack attacks gave the Allies distinct advantages. A lot of this was so top-secret that some archives have only been opened during the 1990's, some 50 years after events took place.