What does "Royaliste Campagne de l'Armée" mean? Royal Campaign of the Army? Maybe I'm wrong, but "Armée Royaliste de Campagne" maybe fits better if you call that the army, rather than a certain campaign in a war.
It means "Royalist Campagne of the Army". Which, imo, means nothing. It's best to consider it as mock-French. Pretty much all of the "French" they use doesn't mean a thing, and even google translate would probably yield better French.
My french is rusty, but I believe campagne... means countryside. So your army there is called the Royal Countryside of the Army.
Yes. It means countryside. However, as countryside, it's a noun, not an adjective. Royalist means the same in English as in French. And as such, it makes no sense here.
