Hundreds of kilometers of Syria and Iraq separate Israel and Iran, but the civil war in Syria has brought the two foes nose to nose. Early on April 9, Israel struck the Tiyas (T4) air base northeast of Damascus. To some, it appeared that Israel was acting on behalf of the United States in retaliating against the Syrian government's alleged use of chemical weapons. In reality, Israel was in pursuit of other quarry: Iran and Hezbollah, which have redoubled their efforts to challenge Israel along its northern border....