 Following the attempted assassination of the Israeli Ambassador to the United Kingdom, Shlomo Argov, by the Abu Nidal Organization, Israel initiated Operation Peace of the Galilee in June 1982, in order to terminate the military activity of the Palestine Liberation Organization and Syrian forces around the Israeli-Lebanese border.With U.S. assistance, Israel and Lebanon reached a withdrawal accord in May 1983, which was then recalled by Lebanon in March 1984, due to pressure from Syria.In 1985, Israel withdrew most of its troops, leaving the South Lebanon Army, an Israeli-supported Lebanese militia, to protect a security buffer zone in southern Lebanon, which Israel considered necessary to prevent attacks on its northern territory.