Yuri_G
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...Additional heroes don't split the army; instead, they give their units to the main hero. In the first week, the additional hero doubles the main hero's army. This allows for faster clearing of necessary objectives. Auxiliary heroes shouldn't fight at all. They deliver troops from the castle to the main hero, visit mills, collect resources behind the main hero so that the main hero doesn't waste precious movement points on it, and perform other tasks that are not suitable for the main hero...
Rarely in this mission, I managed to hire two additional heroes of levels 13 and 14. And their participation in the mission did not go unnoticed.