|Israel invaded Lebanon on June 6th. The immediate cause cited for the invasion was the attempted assassination of Israel's Ambassador in London. Israel's plan was designed first to create a buffer between Lebanon and Northern Israel. The incursion quickly grew to a full-fledged attempt to destroy the P.L.O.
Israeli forces advanced to Beirut. In the course of that advance, a large-scale mini-war broke out with Syria. Over two days, Israel shot down 82 Syrian planes with no losses of its own, and completely destroyed the intricate Soviet-designed anti-aircraft missile system protecting Syria. A cease-fire was reached after Israel surrounded Beirut. Under the terms of the agreement, the P.L.O. was forced to leave Lebanon.