You’ve never heard of the Franco-Prussian War then.
http://en.wikipedia.org/wiki/Siege_of_Paris_%281870%E2%80%931871%29
And that was after the Emperor Napoleon III and almost all of his entire army was encircled and captured at the Battle of Sedan!
Easy ROCK!
It’s just a joke...
And, anyway... the Battle of Hastings has nothing to do with defending Paris.