Factions/Units that are actually being used in Kingdoms

[barvaz]

How can you tell which factions and units are actually being used by the various Kingdoms campaigns?

I unpacked the packs for all four campaigns of Kingdoms and it seems that export_descr_unit.txt and descr_sm_factions.txt contain all/most the units and factions also from the original M2TW campaign even if they are not relevant to the Kingdoms campaign in question.

How does the game determine which factions are being used in each campaign?

How does the game determine which units can be used? I assume they can be filtered by the factions being used but what about all the units that belong to the slave/merc faction? How do I know which are being actually used?

Is there any additional files that need to be parsed? Any special flags or parameters to look for?

I am asking this because I want to extract all the factions/units that are being used by each of the Kingdoms campaigns and only them, without all the noise.

Thanks

- barvaz