[Humakty]

I think you have good chances of success, as even their pretender will probably be an undead.(send those putrescent hordes back to hell !!!!)
For the rest, you should read Evilhomer strategy guide on LA Marignon, wich you will find in the second sticky of this forum. ( if you haven't read it already) It is full of good ideas. It was established on the unmodded game, if you're using CBM you can consider massing cavalry as shields to have a mobile army.