Besieging undead armies

[Knai]

Originally Posted by Gurthang

I am besieging an army of undead, and since they don't need to eat I suppose it's pointless to wait for them to starve

So... what's the solution? Suppose Ermor stuffs a fortress with, say, 600 undeads. How can an average nation ever hope to storm the fortress?

I am considering to use one or more Wall Shakers here. Do they add their fortress reduction values?

All help appreciated!

Spam the fortress with anti-undead spells, bring wall shakers and gate cleavers, so on and so forth. Then, when the fight starts, open with a nice battlefield spell. I don't remember the name, but there is one that basically just massacres undead and blinds living units, which, combined with a nice Banishment communion will end the fight comparatively easily.