When a hero is traveling inside of an army, you won’t be able to use his services.
You just have to select a hero and designate a target by right clicking with the mouse.
After clicking on the target a screen showing available actions and their chances of success will appear.
Each action costs a specific amount of gold and without it you won’t be able to perform it.
You should remember that actions performed on another faction will have negative effects on your relations.
You should always consider whether it’s worth to use it on a specific faction.
Another, somewhat hidden function of every hero is the ability to deploy him in a province.
Each hero punch in has a predetermined effect that will be caused upon his deployment.
There you might check what deploying him will do (by hovering over the icon).
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