HIS103Y1 Lecture Notes - Lecture 23: Double-Cross System, Dilly Knox, Mavis Batey
Document Summary
Britain contribution to allied - mastery of dark arts, secret intelligence, counter intelligence, deception fundamental success which made all else possible hinged upon the british triumph in breaking enemy codes and cyphers. Enigma seemed impregnable, british were breaking 3-4,000 enigma messages away fundamental to british breach was human operator error - mistakes made by encoders on german side which allowed british into system. Dilly knox - mavis lever and margaret rock german spy services broken - tracked down every nazi spy in england. British realized by spring of 42 that they controlled entire german spy network in england. British double cross system popov (codename: tricycle) and pujol (codename: garbo) arrived in britain just as their was enough decrypt material product from breach of system. 15 double agents under their control feeding misinformation to the germans looming. Ability to read h"s mine through ultra secret (intelligence) Summer of 1944 - mediterranean landed in greece, french invasion.
