Joan of Arc vs the Vikings

Last Sunday I was in Paris watching the finish of the Tour de France, just facing the statue of Joan of Arc there was a bunch of Norwegians chanting the name of Thor Hushovd with their flags, I said to myself, a luck Thor Hushovd isn't English, Joan of Arc wouldn't like that:D
This gave me an idea: the year is 911. The Vikings have occupied the lower valley of the Seine for years, and King Charles the Simple is ready to abandon it to them. Then a maiden rises, and persuades Charles that voices have ordered her to drive the Vikings out of France... What happens?
 
The Vikings then lay siege to Paris and maybe capture it this time, as they continue to raid and depopulate West Francia. By 1000, the kingdom is sparsely populated and dirt-poor, except for the interior.
 
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