Well, what seems to be the case is that the army is, in some sense, pre-generated at game creation time, but whatever process is used to actually make that happen doesn't kick in until you enter the area. I tried numerous things in order to try and change the army composition and nothing worked. So it must be using a different seed than the one used in combat. It's probably in the safe file somewhere, but it'd be hard to find it - and even finding it wouldn't really be helpful.
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