Spain declares war on France in 1806

So what if for whatever reason (gadoy resices a false report of Napoleon losing at jena ect.) And acts on his plans of declaring war on France.
Napolions is like on the other side of the continent and going ferther inorder to defeat russia and his generals generally don't Fair well whith out him. But Spain has a vary bad army and experience in the war of the first coalition shows they probably wouldn't be able to cross the Pyrenees whithout major british and Portuguese support.
So how would this effect the Napoleonic war and the peninsula War?
 
Napoléon suspected this was going to happen and overthrew the Bourbons before it could. Of course that created a whole bunch of other problems for him.

This could work out better for him than OTL. His armies most likely defeat the Spanish but, as he is preoccupied with Prussia and Russia, perhaps he does not try to capture Madrid but accepts another peace like that of 1795, where the Bourbons remain in power but agree to be submissive. So then there is no Peninsular war. But do the Bourbons turn on him again later on? (Probably, I suspect.)
 
So what if for whatever reason (gadoy resices a false report of Napoleon losing at jena ect.) And acts on his plans of declaring war on France.
Napolions is like on the other side of the continent and going ferther inorder to defeat russia and his generals generally don't Fair well whith out him. But Spain has a vary bad army and experience in the war of the first coalition shows they probably wouldn't be able to cross the Pyrenees whithout major british and Portuguese support.
So how would this effect the Napoleonic war and the peninsula War?
What if news of Napoleon stunning victory reaches Spain after their formal declaration of war? Would the Spanish seek to pull out when Napoleon brings the full force of his Grand Armee with him? How would this affect a possibility of a Franco-Russian Alliance?
 
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