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This is a list of selected April 9 anniversaries that appear in 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 will soon 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 four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.

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.

April 8 April 10
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Ineligible

Blurb Reason
; Day of National Unity in Georgia (1989) not an article on this topic, just one line; and list referencing is inadequate
1241 – A combined force of Poles and Germans attempted to halt the Mongol invasion of Europe at the Battle of Legnica near present-day Legnica, Poland. multiple issues
1413Henry V, later featured in three plays by William Shakespeare, was crowned King of England. unreferenced section (Ancestry)
1860Édouard-Léon Scott de Martinville recorded himself singing "Au clair de la lune" on his phonautograph, producing the oldest known recording of an audible human voice. cleanup bare URLs
1865Confederate forces under Robert E. Lee surrendered to Ulysses S. Grant at the McLean House near the Appomattox Court House in Virginia, effectively ending the American Civil War. refimprove section
1866 – The Civil Rights Act, the first United States federal legislation to affirm that all citizens are equally protected by law, was enacted. more citations needed
1918World War I: Aníbal Milhais's actions at the Battle of the Lys made him the only person to be awarded Portugal's highest military honour, the Order of the Tower and Sword, directly on the battlefield. close paraphrasing, unreliable source (see talk page)
1940World War II: Nazi Germany began Operation Weserübung, invading Denmark and Norway. refimprove and refimprove section
1942World War II: Japanese forces defeated Allied troops at the Battle of Bataan in the Philippines before beginning to forcibly transfer more than 90,000 prisoners of war to prison camps in the Bataan Death March. page numbers needed
1989 – An anti-Soviet demonstration in Tbilisi, Georgia, was quashed by the Red Army, resulting in 20 deaths and hundreds of injuries. unreferenced section
Francis Bacon |d|1626 inappropriate tone
Easter (Western Christianity, 2023); 12+ citations needed and orange tagged section for expansion and citation

Eligible

Notes

Toppling of the Saddam Hussein statue in Baghdad
Toppling of the Saddam Hussein statue in Baghdad

April 9: Vimy Ridge Day in Canada (1917); Day of Valor in the Philippines (1942)

More anniversaries: