Interesting idea being a Roman legion for NW apart from Legio XIII wasn't Pia Fidelis mate, it was Gemina. Served from late Republican Rome under Caesar and was reconstituted by Augustus. One of the last legions to be disbanded.
Actually Gemina aka "The twin" (since 31 BC) was also nicknamed Pia Fidelis, "Faithful and loyal" while Legio VII Claudia was officially named Pia Fidelis; so I removed the Gemina name and replaced it with its nickname because it sounds better as the tag line meaning (that's why its Legio XIII: Pia Fidelis though the logo probably should be updated to represent that its using a nickname rather then it being an official name).
Plus its a Regiment on a Napoleonic Wars game, who cares if its completely historically accurate anyway so as long as it looks/sounds cool
Fair enough. Either way you look at it, interesting idea. Best of luck!