The goal was to deceive the Axis powers as to the location of the Allies' assault across the Mediterranean and to divert the Axis military commands attention and resources. Operation Barclay used bogus troop movements, radio traffic, recruitment of Greek interpreters, and acquisition of Greek maps to indicate an invasion through the Balkans.
Operation Barclay created a sham army in the eastern Mediterranean: the "Twelfth Army" consisting of 12 fictitious Divisions. Hitler suspected that the Allies would invade Europe through the Balkans, and Barclay served to reinforce this.
As part of Barclay the British also launched "Operation Mincemeat", where faked documents were planted via Spain. To reinforce the impression that an Allied invasion was imminent the Special Operations Executive (SOE), in co-operation with the Greek andartes, mounted "Operation Animals", a series of attacks on rail and road networks.
The deception was successful. The German High Command concluded there was a greater concentration of Allied forces in the eastern Mediterranean than was the case and held to this assessment, making subsequent deceptions more credible. German forces in the Balkans were reinforced from 8 to 18 Divisions, and the Italian fleet diverted into the Adriatic Sea. The Allied invasion of Sicily thus achieved surprise.
The greatly increased number of German occupying forces in Greece resulted in negative consequences for the Greek Resistance. Wide-ranging counterguerrilla operations were carried out, culminating in mass reprisals such as the Massacre of Kalavryta and Distomo massacre.
- Jon Latimer, Deception in War, London: John Murray, 2001
- Bacon, Donald J. (December 1998). Second World War Deception: Lessons Learned for Today’s Joint Planner. Montgomery, Alabama: Air University Press. pp. 3–4. http://www.au.af.mil/au/awc/awcgate/wright/wf05.pdf. Retrieved 24 April 2013.
- Gerolymatos, André (1991). "The Development of Guerrilla Warfare and British Policy Toward Greece 1943-1944". New York City: Pella Publishing Co.. p. p.100. http://triceratops.brynmawr.edu/dspace/bitstream/handle/10066/5569/Gerolymatos_17_2.pdf. Retrieved 24 April 2013.
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