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What is "Stack"? And what kind of spell is "Berserk"?
Added 17 minutes later
By the way, it's a very interesting tactic. When I used it, it usually worked. In my game, Isabel ran around the island, pursued by a Mage with a huge army, for the entire mission, while I accumulated resources and built a powerful army, and then I defeated him. This allowed my castles to develop relatively peacefully. The same thing happened in the first mission when I used two heroes to make him run back and forth between them, while I developed in the meantime. He couldn't focus on just one of them because he would lose his city.
Added 1 minute later
By the way, it's a very interesting tactic. When I used it, it usually worked. In my game, Isabel ran around the island, pursued by a Mage with a huge army, for the entire mission, while I accumulated resources and built a powerful army, and then I defeated him. This allowed my castles to develop relatively peacefully. The same thing happened in the first mission when I used two heroes to make him run back and forth between them, while I developed in the meantime. He couldn't focus on just one of them because he would lose his city