Germany invaded Poland in the free city of Danzig, which started World War II.
Source
German Astronomer Karl Ludwig Harding discovered the 3 Juno asteroid in the Asteroid Belt.
Blacksmith, Patrick Lyon stole $162,821 in cash and gold from a vault at the Bank of Pennsylvania.
Mozart published the Haydn Quartets in Vienna.
The famous Liberty Bell arrived in Philadelphia, US.
Louis XV succeeded his great-grandfather and became King of France at the young age of five.