Wikipedia:Selected anniversaries/April 9

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 * 1917 – First World War: The Canadian Corps began the first wave of attacks of the Battle of Vimy Ridge in Vimy, France.
 * 1940 – World War II: During the German invasion of Norway, Vidkun Quisling attempted to seize power in the first coup to be broadcast over radio.
 * 1945 – The German heavy cruiser Admiral Scheer, the most successful capital-ship surface raider of the Second World War, was sunk by British bombers.
 * 1947 – Sixteen white and black men began a two-week journey in the American South, acting in defiance of local laws that enforced segregated seating on public buses.
 * 1947 – The Glazier–Higgins–Woodward tornadoes killed 181 people and injured 970 others in Texas, Oklahoma, and Kansas.
 * 1948 – Palestine war: Fighters from the Zionist paramilitary groups Irgun and Lehi attacked the village of Deir Yassin near Jerusalem, killing more than 100 Palestinian Arabs.
 * 1959 – NASA announced the selection of the Mercury Seven, the first astronauts in Project Mercury.
 * 1976 – The first EMD F40PH, Amtrak's most widespread diesel locomotive for many years, entered into service.
 * 1980 – Iraqi philosopher Muhammad Baqir al-Sadr (pictured) and his sister Amina were executed by the regime of Saddam Hussein.
 * 1993 – Iranian filmmaker Morteza Avini was killed by a land mine in Fakkeh while producing a documentary.
 * 1999 – Ibrahim Baré Maïnassara, President of Niger, was shot dead by soldiers in Niamey.
 * 2005 – Charles, Prince of Wales, married Camilla Parker Bowles in a civil ceremony at the Windsor Guildhall.
 * 2021 – Burmese military and police forces killed at least 82 civilians in the Bago massacre, including 2021 Myanmar coup d'état protesters.
 * Born/died:| Pope Benedict VIII |d|1024| Jean Quintin |d|1561| Henrik Rysensteen |b|1624| Samuel Fritz |b|1654| William Law |d|1761| Charles Proteus Steinmetz |b|1865| Jørn Utzon |b|1918| Alphonse Alley|b|1930|  Nate Colbert|b|1946| Vilhelm Bjerknes |d|1951| Natascha Engel |b|1967|  Peter Canavan |b|1971Jenna Jameson |b|1974| Jackie Evancho |b|2000| Nick Adenhart |d|2009 Nikki Grahame |d|2021| Nikki Grahame|d|2021|