I forget, French isn't high up on my list of foreign languages I've made an attempt to learn. Which I should probably correct if I am imitating it in BM, though the use of French in Aurvandil is mostly to give a ... feel of Frenchiness rather than to be specifically accurate.
If you're interested:
Cour Impériale De La Noblesse De Chevalerie -> More or less grammatical, although it's a weird construction.
Assemblée de Royal Sovereign l'armée du Haut -> Assemblée Royale Souveraine de l'Armée du Haut
Royaliste Campagne de L'armée -> Armée de Campagne Royaliste
Rois Propriétaire Gardes Impériaux -> I assume you mean "King's household"? The it would be Gardes Impériaux de la Chancellerie
Orvandeaux Battaillon Etrangere -> Bataillon Etranger d'Orvandeaux
Caraque de la sang -> Caraque du Sang or Caraque de Sang
