1982 Lebanon War
The 1982 Lebanon War (Arabic: الاجتياح, Al-ijtiyāḥ, "the invasion"), (Hebrew: מלחמת לבנון הראשונה, Milhemet Levanon Harishona, "the first Lebanon war"), called Operation Peace for Galilee (Hebrew: מבצע שלום הגליל, or מבצע של"ג Mivtsa Shlom HaGalil or Mivtsa Sheleg) by Israel, and later known in Israel as the Lebanon War and First Lebanon War, began on 6 June 1982, when the Israel Defense Forces (IDF) invaded southern Lebanon, after repeated attacks and counter-attacks between the Palestine Liberation Organization (PLO) operating in southern Lebanon and the IDF which caused civilian casualties on both sides of the border. The military operation was launched after gunmen from Abu Nidal's organization attempted to assassinate Shlomo Argov, Israel's ambassador to the United Kingdom. Prime Minister Menachem Begin blamed Abu Nidal's enemy, the PLO, for the incident, and treated the incident as a casus belli for the invasion.
After attacking the PLO – as well as Syrian, leftist, and Muslim Lebanese forces – Israeli military, in cooperation with the Maronite allies and the self-proclaimed Free Lebanon State occupied southern Lebanon, eventually surrounding the PLO and elements of the Syrian army. Surrounded in West Beirut and subjected to heavy bombardment, the PLO forces and their allies negotiated passage from Lebanon with the aid of United States Special Envoy Philip Habib and the protection of international peacekeepers. The PLO, under the chairmanship of Yasser Arafat, had relocated its headquarters to Tripoli in June 1982. By expelling the Palestine Liberation Organization (PLO), removing Syrian influence over Lebanon, and installing a pro-Israeli Christian government led by Bachir Gemayel, Israel hoped to sign a treaty which Menachem Begin promised would give Israel "forty years of peace".