´óÏó´«Ã½

Knowledge is power. Nowhere is this more true than in the theatre of battle. In part 4 of his series, historian and writer Ben Macintyre looks at how espionage and misdirection –often through networks of spies and double-agents – relies on understanding your enemy's psychology. We'll also hear from a former member of the legendary SAS on how information control is vital to success in special forces' operations.