I always take the elf archers instead of knights of the realm. This mission is also a bit luck based, I also needs lots of tries to do it. Never attack by yourself because that could trigger new waves of mummies, only do this when all current mummies are dead. Don't care how long this takes you cant handle all enemies at once. Most damage is done via your bright mage. The most relevant spells are screaming skull which has devastating power and only costs one spell point and crimson bands to disable combat of single enemy regiments. I hope you got the staff of jet and book of ashur? You can try forcing a retreat of a mummy regiment by attacking it from the behind while they are in close combat with a different regiment.
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This happens because you installed Dark Omen in Program files. That location is only writable by an administrator, therefore all write operations are redirected to the VirtualStore for compatibility reasons.
Internally INST stuff is handled like units (at least after the map is loaded they share the same data structure). Attributes have range from 0-10 (like wounds). (can be of course higher, but not sure if this causes problems)