I saw there was no thread about it, and this is strange considering it's huge popularity among NTW modders
The Great War mod is a mod that aims to fully transform Napoleon TW to a World War One game. It currently consists of units for all the major nations who took part in the war (including USA) and a beta, but playable campaign.
The next version, which will appear "soon", will consist of historical accurate textures for most (maybe all) units, some models for artillery (one is already included), and a full campaign with all factions playable.
Hope you will enjoy this mod as much as I do. This is the link for download, don't forget to rep the team:
I'm just a big fan, btw, not a team member.