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What are you talking about when you say "break through"? There are losses, of course, but that's not important here. I even let a strong yellow (Warlock) cast a storm when I attacked him in his castle, and I didn't reload.
I was lucky when I attacked (without magic) the first castle in the campaign; it was guarded by only 3 Hydras. So I took them out without any losses. Then I left a group of Djinns, cast Antimagic on them, and took out all the clever heroes with a storm. And if the computer also used Antimagic, then 7 Djinns look pretty good in melee combat!
Герои - это клёво.