07/25/1939 - Poland gives Britain and France a German Enigma machine each, whose codes they have broken.
http://www.worldwar-2.net/prelude-to-war/prelude-to-war-index.htm
The following site gives some background on this event.
http://www.century-of-flight.net/Aviation%20history/WW2/Enigma.htm
Just trying to make your links clickable:
http://www.worldwar-2.net/prelude-to-war/prelude-to-war-index.htm
The following site gives some background on this event.
http://www.century-of-flight.net/Aviation%20history/WW2/Enigma.htm