The South Lebanon conflict (1985–2000) or the Security Zone conflict in Lebanon refers to 15 years of warfare between the Israel Defense Forces and its Lebanese Christian proxy militias against Lebanese Muslim guerrillas led by the Iranian-backed Hezbollah, within what was defined by Israelis as the "Security Zone" in South Lebanon. It can also refer to the continuation of conflict in this region, beginning with the Palestine Liberation Organization (PLO) operations transfer to South Lebanon, following Black September in the Kingdom of Jordan. Historical tension between Palestinian refugees and Lebanese factions fomented the violent Lebanese internal political struggle between many different factions. In light of this, the South Lebanon conflict can be seen as a part of the Lebanese Civil