bobchik
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No, we were constantly afraid, starting around the third month, if I remember correctly, or rather, as soon as there was an army that we weren't afraid to leave secondary heroes with, and that was around the 3rd or 4th month, after that I started sending the entire army with Sandor.
Hmm, if all the heroes are at their maximum level, then you won't be able to play one of the maps from the Final Campaign, which unlocks after completing the main campaign.
There are only two maps - one for Blood, the other for Tears.
Accordingly, I also had to replay one of the campaigns to level up a Blood hero.