Hi raknefne! First to answer your question - it alternates between the units specified in the "units" box. The "kolvo" and "level" should be empty in this case. If you fill the "races" box then they should be defined and the "units" box should be empty.
I finished the campaign on impossible. It was very interesting and challenging. I liked it a lot. You did an amazing job there. The details are incredible. Thank you for your hard work

. I'll share some thoughts and observations :
Bugs
-the church in Jerneland crashes the game(I wrote about that)
-summoned troops don't count for traps medal. Description says all types count
-alchemic - holy bomb burns undead instead of reducing their stats
-living bow -chat does not work
-Superfly-hero - description says +20% fire damage,but actually he gives +40 points of fire damage which makes the lake dragon fly to deliver 41-43 dmg compared to the original 1-3. It was a fun fight anyway

-citizen house(lower trent) crashes the game
-rune mage - descriptions of high mage and runic feats are switched
-Krasen - barbarian tent crashes the game
-returning to Jerneland in late game and trying to speak to count Bob led to an empty chat, I had to restart the game
-there is a hidden chest by the snake nests in Krasen's dungeon, which gives an error message
-When I killed the king on Krasen , there was no more a major quest. I was kinda wandering what to do. Who is responsible for the climate changes? Who should I kill to finish the game? It was confusing. Then I decided to kill the boss and it ended.
Maybe Bugs
-miss Brok who guards the map for Sprudne Island can be circumvented to get the map(I fought with her).
-getting past the guardian of Agvares(companion) is too easy also
I don't know if you let these armies mobile intentionally, but there is a way to completely immobilize an army.
-after killing the frog(enchanted orc woman),when i talk to the shaman he acts like i have done his quests(i did not yet) and gives me access to additional stuff in the castle and the two shops.
Suggestions
-remove mass resurrect from paladins(I intentionally don't use them,because they make it too easy)
-inkvisitor's ressurect is also too powerful
-dragons should have their normal price and leadership(they are too powerful anyway)
-remove gold for losses for hard and impossible
-medals can be extended to level 4 - I've made most of them in lower trent
-spell - call of nature is unusable with such a high mana-price , should be 10-20-30
-the experience shrines especially in middle and late game give so few exp that it is irrelevant
-remove some abilities from phantom creatures, especially creatures with resurrect. Making a phantom of a rune mage leads to infinite resurrect of black dragons for example.
-spell-turn back time - should increase mana with levels, it is very powerful
-spell-magic shackles - should not have leadership limitation,because with the increased difficulty the armies are so big , that this spell is unusable.
The length of the game was very good. I finished at level 36. I guess it can go to 37-38, because I left some armies and my learning skill was just basic. It would've been good if you added some new creature abilities or creatures

.
Thank you again for the amazing campaign!