Actually, the whole content of Category:Neapolitan War is an error. The description, and the profiles included, all refer to Napoleonic wars in general, or to a particular war which is not the Neapolitan war (e.g., Pierre Wurtz was in the campaign of Russia and died there in 1812). Even Napoleon himself did not personally take part in the Neapolitan war and should not be in the corresponding category.
So the easiest solution would be to change the name of the category, as Richard suggests, if it is doable.