WOIN Which rulebook(s) for Napoleonic Wars?

[Belisarion]

As I understand, O.L.D. covers everything up to the Age of Sails and N.O.W. starts with Western(?)
The Napoleonic Wars are somewhat in between and both books cover muskets, though O.L.D. more than N.E.W.

 

[Morrus]

I’m honestly not familiar enough with the time period to say but I’d guess at OLD?