 From 1936, Captain Michałowski was an Enigma-intelligence contact of Major Jan Leśniak of the Polish General Staff's German Office.After Germany invaded Poland in September 1939, then-Major Michałowski made his way to France, where he became part of PC Bruno's Polish "Team Z", which broke German ciphers, including Enigma.After France's capitulation to Germany in June 1940, he served with his Polish cryptologist comrades at Polish intelligence "Station 300" (French codename