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By Peter Bergen, CNN National Security Analyst
Editor's note: Peter Bergen, CNN's national security analyst, is a director at the New America Foundation. His book "Manhunt: The Ten-Year Search for Bin Laden; From 9/11 to Abbottabad" will be published on May 1.
Washington (CNN) – Tapping away at his computer in the study of the suburban compound in Abbottabad, Pakistan, that he called home for the last years of his life, Osama bin Laden wrote memos urging his followers to continue to try to attack the United States, suggesting, for instance, they mount assassination attempts against President Obama and Gen. David Petraeus.
While he urged his organization on to attack America, bin Laden was also keenly aware that al Qaeda was in deep trouble because of the campaign of CIA drone strikes in Pakistan and also because the brutal tactics of his followers had alienated many Muslims.