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Okay, I figured it out. The heroes simply refused to attack cities at close range. I just placed the heroes from the cities on an adjacent tile (by the way, I used teleport to put them in the city; is there a way to place a hero "as a guest" and disable them?). And could you please provide more details about the quests? Where can I configure them, how can I add descriptions? How can I create an "empty" quest (only a description, completed by a script)?