Wikipedia:Selected anniversaries/October 20

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This is a list of selected October 20 anniversaries that appears on the "On this day" section of the Main Page. To suggest a new item, in most cases you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial, or on a day that is or soon will be on the Main Page, please post your suggestion on the talk page instead.

Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only 5–6 events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is not generally posted this year if it is also the subject of the scheduled October 20, 2019 featured article or the October 20, 2019 featured picture.

To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.

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Blurb Reason
1572Eighty Years' War: Soldiers of the Spanish Tercios waded across the river Scheldt at its mouth, walking overnight in water to chest height, to relieve the siege of Goes in the Spanish Netherlands. needs more footnotes
1818 – The United Kingdom and the United States signed the Treaty of 1818, which settled the Canada–United States border on the 49th parallel between the Rocky Mountains and Lake of the Woods. refimprove section
1827 – An allied British, French, and Russian naval force destroyed a combined Ottoman and Egyptian fleet at the Battle of Navarino, a decisive moment in the Greek War of Independence. refimprove sections
1883 – Peru and Chile signed the Treaty of Ancón, ending Peru's involvement in the War of the Pacific. War featured on March 23; Treaty is unreferenced stub
1961 – The Soviet Union performed the first armed test of a submarine-launched ballistic missile, launching an R-13 from a Golf-class submarine. refimprove section
1973Elizabeth II, in her capacity as Queen of Australia, formally opened the Sydney Opera House on Bennelong Point in Sydney Harbour. refimprove section
1991 – An urban fire killed 25 people, injured 150 others, and destroyed over 3,000 homes in the cities of Berkeley and Oakland, California. refimprove section



October 20

Maria Theresa of Austria
Maria Theresa of Austria

Pauline Bonaparte (b. 1780) · Tom Petty (b. 1950) · Farooq Leghari (d. 2010)

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