Historical Events on October 18

Polish–Soviet War — conflict between Poland and Soviet Russia following the First World War (February 1919 - March 1921)

European Social Charter — 1961 Council of Europe treaty

water polo at the 1964 Summer Olympics — Water polo at the Olympics

Hijacking of Lufthansa Flight 181 — 1977 aircraft hijacking

German Autumn — 1977 season of politically-motivated terrorist crimes in Germany which lead to the formation of cross-party crisis committees by chancellor Helmut Schmidt; widely regarded as the most serious crisis in post-WWII Germany

Croat–Bosniak War — conflict (1992–1994) between the Republic of Bosnia and Herzegovina and the Croatian Republic of Herzeg-Bosnia (supported by Croatia)