14th of July, celebrated in France as a memorial of the storming of the Bastille (a large prison in Paris) in 1789. It marked the beginning of the French Revolution.

I dare assume this is correct, so I'll forge on with this new question:

Talking about revolutions - In late 1989, a group of political activists in Dresden wanted to enter a compund known to be operated by the KGB to secure secret service documents from destruction, as had been done in Stasi headquarters during the peaceful revolution of that autumn. When they tried to enter, they were met by a Soviet KGB officer speaking flawless German who told them in polite but no uncertain terms that a forceful entry into a compund operated by the Soviet Union would entail grave consequences, and that nobody entering could hope not to meet with violent resistance. So in the interest of keeping law and order in these uncertain times, would they kindly refrain from entering. Which they did.

Who was the officer?

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Non sunt multiplicanda entia praeter necessitatem.