Rexsar
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Hmm, is the entire territory cleared before reaching the castles? Maybe it's better not to rush into battle as quickly as possible, but to accumulate creatures first? Every month, caravans arrive, increasing the number of creatures. Although it will be more difficult later, it's still worth considering.
As an option... It will minimize the damage from chaos.
It's worth a try. Ganking, as I understand it, is not a good option. It doesn't work at all against the Chaos faction.