1) Since combat scripts cannot be used in multiplayer (as mentioned many times above), it's not possible.
2) There is no scripting function to hide units with the fog of war. Therefore, it's not possible.
Is it possible to disable the multiplayer control over combat scripts?

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1