In 1948 the United Nations launched the United Nations Truce Supervision Organization following the conflict that erupted between Israel and its Arab neighbors, who profoundly opposed the creation of a Jewish state. UNTSO quickly found itself overseeing the ceasefire lines between combatant parties. In the ensuing decades, as countries along the eastern Mediterranean engaged in a series of escalating military conflicts, UNTSO was continually challenged in its peacekeeping mission, often having to alter its configuration. Matters came to a head in 1982, when Israel invaded Lebanon for a second...