is it not true that on all sides, they were reluctant to use intelligence to direct their operational boats because they feared it would make the enemy aware of the fact that the codes had indeed been broken?
i remember reading something about the British Admiralty deliberately NOT rerouting some convoys to make the germans think that enigma was still secure. (not that they were happy to sacrifice their merchants but they only rerouted convoys based on information which could have also been acquired through other means than enigma code breaking. something like that, anyway)
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And when an 800-ton Uboat has you by the tits... you listen!
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