Valerichek
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The thing is, one of the campaign heroes doesn't have to fight them; he can recruit them for free (if they are undead).
Added 2 minutes later
Anyway, I started playing as Constantine again, cleared out all the territory up to the Orcs with my starting troops without any losses, and even with a profit. I killed the Orcs and completed two quests already – the one for the club, which was guarded by a mixed squad near the quest houses, and the one for the Claw (there was some strange behavior – he ran around, but didn't want to go to the town. I had to take care of it myself).
Added 2 minutes later
Anyway, I started playing as Constantine again, cleared out all the territory up to the Orcs with my starting troops without any losses, and even with a profit. I killed the Orcs and completed two quests already – the one for the club, which was guarded by a mixed squad near the quest houses, and the one for the Claw (there was some strange behavior – he ran around, but didn't want to go to the town. I had to take care of it myself).