Wikipedia:Selected anniversaries/April 18

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 * 1689 – Glorious Revolution: Provincial militia and citizens in Boston revolted, arresting officials of the Dominion of New England.
 * 1864 – American Civil War: African-American Union soldiers were massacred and mutilated during and after the Battle of Poison Spring.
 * 1881 – The painted ceilings of the Natural History Museum, London, were unveiled when the building opened its doors to the public.
 * 1915 – World War I: Hit by ground fire, French aviation pioneer Roland Garros (pictured) landed his aircraft behind enemy lines and was taken prisoner.
 * 1949 – The Republic of Ireland Act 1948 came into force, declaring Ireland a republic and terminating its membership in the British Commonwealth of Nations.
 * 1958 – Controversial American poet Ezra Pound was released from St. Elizabeths Hospital, a psychiatric hospital in Washington, D.C., in which he had been incarcerated for twelve years.
 * 1996 – Operation Grapes of Wrath: Israeli forces shelled Qana, Lebanon, killing at least 100 civilians and injuring more than 110 others at a United Nations compound.
 * 2019 – The United States Department of Justice released a redacted version of the Mueller report about the investigation of Russian influence on the U.S. presidential election to Congress and the public.
 * Born/died: | Gratian |b|359| Ippolita Maria Sforza |b|1445 or 1446| Lucrezia Borgia |b|1480| John Leland |d|1552| Polydore Vergil |d|1555| Paul-Émile Lecoq de Boisbaudran |b|1838| Ludwig Levy |b|1854| Bertha Isaacs |b|1900| Pigmeat Markham |b|1904| Martha Ripley |d|1912| Gertrude Vanderbilt Whitney |d|1942| Albert Einstein |d|1955|Robert Christgau |b|1942