HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Regarding the protection of sawmills - the map settings state "monsters - 5". Strong - 4. Should this also serve as a challenge?%)
I changed the monster strength in the settings from random (did you notice the bug - changing the mod name resets all settings to default?) to strong - it returned to 4. Unfortunately, I didn't think to run a few more generations - later (20 generations) the random setting started working as it should (I thought it might be a new, trendy feature...).

Okay, this is related to the fact that when updating to HD, the settings are reset, and before the player chooses the monster strength, it defaults to an incorrect value (which eventually transforms into 5). The game supports a monster strength of 5, but it cannot be selected through the game interface.
If you delete the line "< HD.TE.Settings >" in _HD3_.ini and don't touch the buttons for selecting monster strength, they will again be 5, and the sawmills will be guarded. The other guards will also increase because of this.