I just got out of a war, we had 2 undeads in our kingdom that were not "with" our kingdom, they joined w/ the merger and did their own thing against the monarchs orders, which included running uber low defense (less then 40 dpa w/ army in) and super high offense and suiciding. They were dropped from ~700 apiece at start of war to ~350 and stayed in the 250-450~ range the entire rest of the war, and though they were that low, because they kept their offense sent out, they were able to chain the 750-1000 acre provinces w/ 4 attacks a set (warriors running rax so 2-3 sets a day) just the same as they would have been able to if they were at 700+ acres still, the only downfall was they could not keep it worth anything b/c they had no defense to begin with, but I have to admit, though they lost us the war (losing 1400 apiece that we just could not get back) their ability to maintain 8 attacks a day apiece for decent to great gains against the enemies main attackers, as well as massacring their top provinces near the end, for being our BOTTOM provinces, was quite a sight, and just goes to show the resilience and power of the undead.
Myself, I capped out at reaching ~1080 in the war, but around that time I became the focus target (lol tends to happen that way), and was immediately dropped down to ~600, but I climbed back up to 840 and held it through to the end
Let the building commence, it was really quite a war, 3 dragons apiece from each side, huge fluctuations in the war graphs, and of course like i said the low acre wreckless suiciders that were a likened to wild cards
Ahh, Utopia....
http://www.youtube.com/watch?v=-f3NWDbaJw4
Oh, and if you are wondering, yes, we took them out. They are no longer w/ us anymore, those 2 as well as another who was causing problems.