HMM: David Petraeus was brought down after betrayal by vengeful CIA agents and his own bodyguards who made sure his affair was exposed, claims new book. “The book also claims that Petraeus and Ambassador Chris Stevens were caught off guard by Benghazi consulate attack because they weren’t briefed about on-going U.S. military operations in Libya. Webb and Murphy say Benghazi attack was a retaliation for secret raids authorized by Obama security adviser John Brennan.”