Summary: On a moonless night on Sunday May 1st, four American military helicopters descended on a compound in the quiet town of Abbottabad in north-west Pakistan. Their mission to capture and if need be, kill, United States Enemy Number One - Osama Bin Laden. They succeeded and America's most exasperating manhunt was over. But how did the risky operation unfold both in Washington and in Pakistan? Rob Walker reports for Assignment.
