OPERATION FORTITUDE: The Closed Loop D-Day Deception Plan
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This paper also proposes that the plan was so well executed because it was a “closed loop” plan. That is to say that the British controlled not only the information going forward to the Germans, but they were also in the enviable position of being able to determine the exact extent of the Germans’ belief in the veracity of the information that they were given. This was due to two factors: the British had complete control of all German agents in England by the second year of the war, and the British were able to read encrypted German message traffic, often as fast as the intended recipients.
In the final analysis, the Germans were completely outmaneuvered in the intelligence department during the Second World War. Through sloppy work on their part and the amazingly well manufactured deception story put forth by the Allies, the Germans were essentially blind while trying to defend the Normandy beaches.
The research for this paper was conducted solely using open-source material. Many of these were secondary sources, though others were recently declassified operational documents from the British and United States historical records.
Major Ernest S. Tavares Jr. USAF
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OPERATION FORTITUDE - Major Ernest S. Tavares Jr. USAF
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Text originally published in 2001 under the same title.
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OPERATION FORTITUDE: THE CLOSED LOOP D-DAY DECEPTION PLAN
by
Ernest S. Tavares, Jr., Major, USAF
TABLE OF CONTENTS
Contents
TABLE OF CONTENTS 4
Preface 5
Abstract 6
Introduction 7
Background 9
The XX Committee 9
The Double Cross System 10
Agents 10
GARBO and the GARBO Network 11
BRUTUS 12
German Intelligence Systems 13
The Role of ENIGMA 14
Plan BODYGUARD 17
FORTITUDE NORTH 18
Agent’s Roles 18
Wireless Deception 19
Physical Deception 20
FORTITUDE SOUTH 22
Agent’s Roles 23
Wireless Deception 24
Physical Deception 24
Post D-Day 26
Agent’s Roles 26
GARBO’s 8 Jun Message 26
German Assessments and Reactions 27
Conclusions 30
Appendix I 31
Appendix II 32
REQUEST FROM THE PUBLISHER 36
Bibliography 37
Preface
This paper represents a semi-formal study of the greatest deception operation of World War II, and possibly the greatest military deception operation in the history of warfare. This was a story that fascinated me from the first time that I had heard the remarkable story of Juan Pujol, the incredible Agent GARBO, who with no formal training deceived the vaunted German armed forces. It is a story that needs to be brought into the mainstream because this man, and men and women like him, ensured the defeat of the Third Reich during World War II.
I would like to thank Dr. Rich Muller of the Air Command and Staff College staff for his guidance and enthusiasm. He has made the drudgery of a research paper almost fun. I would also like to thank the staff of the Air University Library and the Air Force Historical Research Agency, both at Maxwell Air Force Base, for without them, little of my research could have been done. Finally, and most importantly, I would like to thank my wife Cindy, and my children Jenny and Lindsey; without their understanding and support, this paper would never have been finished.
Abstract
Operation FORTITUDE, the D-Day deception plan,