In article , Biz WD=?ISO-8859-1?B?2A==?=HCO
writes:

(2) Britan could not directly go after subs and ships. To do so would tip
the Germans that the code was broken and force them to change their wheels
on a daily (or hourly) basis. Remember it took 3 weeks (and I suspect much
more) to break each code. So even though they had a stolen Enigma and the
tools to break the code - it would have been of little use if the code was
changed daily.

It's a pretty well known story (maybe even true) that the Brits knew the German
air raid was coming to Coventry (by breaking the code and/or watching the
bombers on radar), several hours in advance, but deliberately did not warn any
civil defense or firefighters in Coventry, for fear of tipping the Krauts that
we were reading their mail.

So apparently Churchill was willing to sacrifce Brit lives, and not jsut US
sailors, to hide the code breaking. --Mike K.

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