Bad grammar. First, Napoleonic wars is a mod for Warband. And With Fire and Sword is like a billion times inferior to Warband. Do warband, if anything.
You want to make a regiment for Napoleonic Wars, or Mount and Musket? MM is free, but napoleonic will have more players. And no, it's not a dlc. It's another mod.
Ah I see what your getting at, both, one for free the other for napoleon. We can do both. TS is free but without a server we won't be taken to seriously.
Make a regiment for the Warband Mount and Musket mod. People have plenty of line battles where each regiment is like a line infantry unit. Looks pretty cool.