23 September 1779: John Paul Jones declared “I have not yet begun to fight!” aboard the American warship Bonhomme Richard in the battle against the British man-of-war Serapis.
23 September 1806: Lewis and Clark arrived in St. Louis, Missouri, at the end of their daring expedition to the Pacific Northwest.
23 September 1846: German astronomer Johann Gottfried Galle discovered the planet Neptune.
1862: Otto von Bismarck was appointed prime minister of Prussia by William I.
23 September 1939: Sigmund Freud, the founder of modern psychoanalysis, died in London.