Black September was a war that was fought in Jordan between the armed forces of Jordan and Palestinian Liberation Organization. The Jordan Armed Forces were under King Hussein while the Palestine Liberation Organization was under the leadership of Yasser Arafat. The conflict was at its peak between September 16 and 27, 1970. There was, however, some tension and aggression up to July 1971. The Black September was brewed by the Palestinians presence and aggression in Jordan.