In 1982, israel engaged in a war with lebanon because

The Lebanon War of 1982, called by Israel "Operation Peace for Galilee" and also sometimes known as the First Lebanon War, was an armed conflict that began on June 6, 1982 when the Israel Defense Forces invaded the south. of Lebanon with the aim of expelling the PLO from that country. The Government of Israel ordered the invasion in response to the attempted assassination of the Israeli ambassador to the United Kingdom, Shlomo Argov, by the Abu Nidal group. See also Operation Litani.