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In this case, the army (there are also other units, similar in number) is stationed in the castle, but the computer cannot take it. As soon as the player takes the garrison in front of the city, defeats the boss, the gnomes activate a hero with skills focused on combat (strength is present, magic is not needed), he takes the army and runs away like any other, I haven't even checked how to defeat him, I haven't tested the unfinished map.
Added 1 minute ago
Ideally, darkness is needed against him, but if the player doesn't take it... how does this mod change the balance on the map?