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Which Valeska are you referring to? Don't get confused. We're talking about the situation when Sorcha arrives with 10 marksmen, meaning 14 in the castle + 10 + 10-20 with the second hero, totaling 34-44.
and if 10 units arrive, will we fight with 24 units?
It doesn't always survive well, and only thanks to mages.
Everyone knows how to shoot with archers; try controlling melee troops.
and if you attack with about 50 demons, that's it... you can make soap from swordsmen...
In general, it seems you didn't understand my position. I'm not saying that this is the best option; I'm stating that it's simply playable.