On December 3–7, 1939, Braquenié accompanied the chief of the Polish cryptologic team, Lt. Col. Gwido Langer, to London and Bletchley Park.
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Władysław Kozaczuk, Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two, edited and translated by Christopher Kasparek, Frederick, MD, University Publications of America, 1984, pp.
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Following France's capitulation in June 1940, Braquenié evacuated south to unoccupied, Vichy France with other Bruno staff, and subsequently served at the "Cadix" center that was then established near Uzès, not far from the Mediterranean Sea.
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