Early last year, General Khalifa Haftar left his home in northern Virginia—where he had spent most of the previous two decades, at least some of that time working with the Central Intelligence Agency—and returned to Tripoli to fight his latest war for control of Libya. Haftar, who is a mild-looking man in his early seventies, has fought with and against nearly every significant faction in the country’s conflicts, leading to a reputation for unrivalled military experience and for a highly flexible sense of personal allegiance. In the Green Mountains, the country’s traditional hideout for rebels and insurgents, he established a military headquarters, inside an old airbase surrounded by red-earth farmland and groves of hazelnut and olive trees. Haftar’s force, which he calls the Libyan National Army, has taken much of the eastern half of the country, in an offensive known as Operation Dignity. Most of the remainder, including the capital city of Tripoli, is held by Libya Dawn, a loose coalition of militias, many of them working in a tactical alliance with Islamist extremists. Much as General Abdel Fattah el-Sisi has boasted of doing in Egypt, General Haftar proposes to destroy the Islamist forces and bring peace and stability—enforced by his own army. ... Haftar is a top-priority assassination target for Libya Dawn’s militias. Last June, a suicide bomber exploded a Jeep outside his home near Benghazi, killing four guards but missing the primary target. Now there is heavy security around Haftar at all times. At his base, soldiers frisk visitors and confiscate weapons. A few months ago, someone reportedly attempted to kill him with an explosive device concealed in a phone, and so his men collect phones, too.