Question

Lois XVI was forced to take notice when this medieval fort was taken by 800 Parisians and the event is now celebrated as the French Independence Day

Answer 1

I'm sorry I don't know. Maybe @TheSmartOne can help.

Answer 2

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It was the Bastille! And the Bastille was a fort that had weapons and used to keep prisoners in there. So all the citizens stormed it and took apart the fort brick by brick.
Here is more about it: http://en.wikipedia.org/wiki/Bastille_Day

Answer 3

And @FelicitySchimke @~ was correct. I would know :P