Mike Knudsen wrote:


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.

Thats the difference in looking at the fact after versus before the
occurrence.
One of the techniques used by both sides was to send literally hundreds
of fake messages along with the 'good' one. This kept the decoding gals
busy and still left some doubt about which one(s) were the real messages.
If they had copied mail that included every city in Britain as a
target...and later one in particular got bombed...its quite easy to say
that they knew ahead of time and here's the evidence to prove it.

-BM