The Peninsula campaign features NTW3 Classic Battle units, uniforms & stats for Multi-Player campaigns.
Players can choose from the British, French or Spanish factions in the Multi-Player or Single-player campaigns.
The NTW3 v9.4 mod download is posted on Mod DB: https://www.moddb.com/mods/napoleonic-total-war-3
The change log for the Peninsula campaign is listed here: https://cosak.alwaysdata.net/#