is now peering into the abyss that witnessed during the darkest days of its civil war, the first and longest sectarian conflict in the post-colonial Arab world. The conflict dragged on for 15 deadly years. The human costs, in a country smaller than Connecticut, were staggering: 150,000 killed and a million people — one-fourth of the population — displaced. The economy collapsed and destruction totaled $25 billion. Along the way, Lebanon’s militias introduced tactics, most notably the suicide bomb, that have defined asymmetric warfare worldwide ever since.