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I don't know what to call it (maybe I'm just lucky) - but in my game, almost at the very beginning of the mission, all the barons have a huge army, and when you hover over them, it shows a red skull indicating a threat. But when I captured the Necropolis Castle, then the Violet Castle, and went further to the lower left Castle, during its capture, another hero came from the other bridge, captured the former Necropolis Castle, and ran up to my fort, capturing it as well. I quickly returned to recapture the Castle, and when I caught that hero and killed him, I noticed that he had left almost his entire army in the fort. That's how, without letting anyone else get close to that fort, I deprived the enemy of his main army and quickly captured the rest.
That's absolutely correct. I'm currently replaying the game on hard difficulty without saving, and therefore I consider myself entitled to take advantage of the AI's idiocy. This is exactly that tactic. You capture a fort (well, I don't want to give up the Castle, so the computer rebuilds it), "lure" the enemy hero with a large army towards it, he captures it and halves his troops, which can be defeated individually even without any losses