This report is the final installment of a four-part series on the revolution in Libya.  Part Four: The Tide Turns details the final rebel offensives and the challenges the new government faces.  The first section documents the conflict in the Nafusa Mountains, the characteristics of the rebel forces and the factors that led to their breakout.  The second section explains the taking of Tripoli and the fighting at the last remaining strongholds.  Lastly, the final section discusses the obstacles the rebels must overcome to stabilize the country and transition to a democracy successfully.