 Nyorai kupfuurira kweiyi ndima - Pana 17 September 1939, zuva iro Soviet Union yakatanga kupinda kwayo muPoland, vashandi veCipher Bureau vakayambuka muganhu wokumaodzanyemba kwakadziva kumabvazuva kwenyika yavo vachipinda muRomania. Pakupedzisira vakazoenda kuFrance, uye musi wa20 Gumiguru 1939, pa PC Bruno kunze kweParis, vaPolish cryptanalysts vakatangazve basa paGerman Enigma ciphers mukubatana naBletchley Park. 