On this date in 1917, one of the most famous spies in history was executed.
Mata Hari was the stage name of a Dutch woman named Margaretha Geertruida Zelle. She became famous for, well to put it impolitely, kinda being a ho. She was a dancer known for performing "exotic" dances that seemed to consist of her wearing some kind of vaguely eastern costume and taking it off. She had a whole back story that she was born in an Indian temple and was taught sacred dances by the priestesses. However, it was all a pack of lies and what she knew of Indian and Javanese dances she learned while in Malaysia with her husband who was in the Dutch Colonial Army. But nobody knew or cared, because Internet porn was like, 70 years away. She was known as a famous courtesan, which is nice way of saying she was a gold digger. She was widely rumored to be banging( to use the parlance of our times) a bunch of high-ranking military officers both in the French and German armies. So, in 1917, the French authorities arrested her on suspicion of treason and espionage and sent her to the St. Lazare Prison in Paris. During her military trial, she was accused of revealing details of the new weapon, the tank, resulting in the deaths of thousands of soldiers. She was convicted and sentenced to death.
Also in 1860 an eleven-year-old girl named Grace Bedell, wrote a letter to presidential candidate Abraham Lincoln, suggesting he could improve his appearance by growing a beard.