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a way to defeat enemies: some kind of secret path or means. There are constantly not enough resources, so the troops, which are rapidly increasing in the Castle due to events, cannot be bought. The player is too weak. And when enemies come and start pressing from three sides, there is nowhere to go. I got into a boat and sailed north, hoping to capture the 3rd Castle, but the monsters on the way and the guards are too strong, and I had to abandon this idea.
I read the comments on the map on that website with a translator, but I didn't learn anything important, except that some people were able to complete it, but I have no idea how. Maybe, if you set the difficulty to medium or even low, you can still become strong enough to face the enemies.
Ah, I just reread the translation of the comments: well, yes, the first player who managed to complete it used the well-known "tool against which there is no defense": he hired a Necromancer, collected the King's Undead Cloak, "bred" a bunch of Liches, and defeated everyone! If the map can only be completed this way, then it is disappointing: in my opinion, there should be a more normal way to achieve success.
the map is definitely 160% and 100% passable, since the Necromancer arrives not on the 3rd, but on the 5th month, + due to resources, it is possible to place Angels in your city, and it also turns out to buy troops and suffer fewer losses in battles with the AI
the main difficulty is that the Necromancer arrives in different places from one-way paths and starts taking everything
regarding the Necropolis: even without power-up Necromancer, the Necromancer will confidently mow down the bones, given the size of the guards, there will be a lot of bones in the end, but this simply kills any interest in completing the game