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Where did you get the information about the increased battlefield size during a siege?
From the developers.
The battlefield size during a siege corresponds to the size of the battlefield in Heroes of Might and Magic III.
It's not difficult to calculate how long it will take for Hydras and Minotaurs to reach the castle. On such a battlefield, without the most powerful magic, it's not even worth trying. The game was designed for 8x10, and it seems they didn't consider that some people would be attacking castles in Nival.