Palestinian political violence between two loosely defined factions: the side wishing to preserve the status quo, consisting primarily of Maronite militias, and the side seeking change, which included a variety of militias from leftist organizations and guerrillas from rejectionist Palestinian (nonmainstream PLO) organizations. The Lebanese civil war lasted until 1990 and resulted in an estimated 130,000 to 250,000 civilian fatalities and one million wounded. After Black September, the PLO and its offshoots waged an international campaign against Israelis. Notable events were the Munich Olympics massacre (1972), the hijacking of several civilian airliners (some were thwarted, see for example: Entebbe Operation), the Savoy Hotel
Palestinian insurgency in South Lebanon By 1975, more than 300,000 Palestinian displaced persons lived in Lebanon. Aside being used as an operation base for raids on Israel and against Israeli institutions across the world, the PLO and other Palestinian militant organizations also began a series of airplane hijack operations, targeting Israeli and international flights, carrying Israelis and Jews. The more profound effect on Lebanon was destabilization and increasing sectarian strife, which would eventually deteriorate into a full-blown civil war. In reaction to the 1972 Munich massacre, Israel carried out Operation Spring of Youth. Members of Israel's elite Special Forces landed by boat in Lebanon on