What is special about December 5th in history?

  On December 5, 1968, the "two bombs" Mr. Guo Yonghuai was killed in a plane crash. He and his security guard Mou Fangdong died to protect the precious experimental data files in the briefcase with their bodies.

  On December 5, 1791, Mozart died of illness.

  December 5th is there every year, which year today has a special meaning to you?

What unforgettable thing happened?