Political map of the Eastern Mediterranean 18 September 1970 (Black September): Following the Six-Day War, forces (Palestinian fedayeen) of the Palestine Liberation Organization (PLO) shifted to Egypt and Jordan to continue their struggle (War of Attrition), with most eventually concentrating in Jordan. By late 1968 this was causing problems in Jordan itself, as elements of the PLO attacked Jordanian authorities and even threatened regime change. Losing his patience, King Hussein of Jordan launched an offensive against the PLO in September 1970 and, despite a Syrian attempt at intervention, expelled them from the country (Black September).