Black September (Arabic: أيلول الأسود Aylūl al-ʾAswad), also known as the Jordanian Civil War,[9] was an armed conflict between Jordan, led by King Hussein, and the Palestine Liberation Organization (PLO), led by chairman Yasser Arafat. The main phase of the fighting took place between 16 and 27 September 1970, though certain aspects of the conflict continued until 17 July 1971.
After the 1967 Six-Day War, Palestinian fedayeen guerrillas relocated to Jordan and stepped up their attacks on Israel and the occupied territories. They were headquartered at the Jordanian border town of Karameh, which Israel targeted during a battle in 1968, leading to a surge of Arab support for the fedayeen. The PLO‘s strength grew, and by early 1970, groups within the PLO began calling for the overthrow of Jordan‘s Hashemite monarchy, leading to violent clashes in June 1970.