9/11: It was a PR stunt which killed thousands and launched a propaganda war that has, so far, lasted a decade.
Since then, the US and al-Qaeda have competed furiously to win 'hearts and minds' with elaborate media strategies. Spin, threats, lies, censorship, the killing of journalists; how far has each side been prepared to go to win the propaganda war?
In the 'war on terror' the exploitation of images was to become a matter of life and death, as both the US and al-Qaeda bombarded the world with media designed to win people over to their side.
It started with 9/11 itself: an act of terror staged as a global media event and the catalyst for a decade of propaganda war.
But al-Qaeda's canny use of 9/11 imagery, which included saving footage of the attackers for release at a later date so as to maximise publicity, gave way to serious errors in judgement as the group's use of beheadings not only terrorised viewers but also alienated one-time sympathisers.
The US, for its part, did not perform any better with Guantanamo Bay and Abu Ghraib becoming prime examples of how to lose a war.
And so, the image war goes on.
This episode airs from Tuesday, September 6, at the following times GMT: Tuesday: 2000; Wednesday: 1200; Thursday: 0100; Friday: 0600; Saturday: 2000; Sunday: 1200; Monday: 0100; Tuesday: 0600.