Casus Belli (=Warcase) is a singleplayer modification for M&B Warband made by Yldrania. The alpha version took just one day to make and it does not aim to become one of the top-mods. It is simply a modification that changes the interfaces and apperanance and with that also the experienec within the game from the old one to something fresh.
Credit for the amazing graphics to Indigodeep.