Libya#039;s enigmatic General Khalifa Haftar has been on different sides of almost every power struggle in Libya since the 1960s. He initially fought for Muammar Gaddafi, then against him. He fought alongside Islamist rebel groups in the uprising that toppled Gaddafi in 2011 before becoming their nemesis this year. Just as he was fading from the scene, he has re-emerged as the leader of the most serious challenge yet to the post-revolutionary government, which accuses him of being a renegade driven by a thirst for power. Rise and fall Alongside Gaddafi, Gen Haftar was part of the cadre of young army officers who seized power from Libya#039;s King Idris in 1969. He remained a close ally of...