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ifnt

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How to set up military objectives for allies in a war? I still haven't figure out how in my Oman game when I really needed Hedjaz to beat down Yemen's army for me instead of besieging Shammar...
 

Drakken

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Look on your province screen when you click on the province you want to set as an objective; you'll notice a "Set Objective" button.
 

unmerged(318660)

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Note: as far as I can tell, this will only set the next target to be sieged. So if your subject's army is sieging another province already, they will not abort or switch until the current siege is over. Please correct me if I'm wrong or someone saw their subject abort a siege.
 

stilgarpl

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My allies in my current war don't listen to me. I told Korea (my vassal) to go siege Beijing, but their 15k army is in Busan.
Did you also told them to be agressive ? If you set their behavior as passive, they won't siege anything. You can do that in the "Subjects" tab, it's the button in the bottom right of the window.
 

Nassau

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Similar. Told a CN to siege a province, but they didn't. Although it was an island, it could be reached by land and I and the CN had ships there keeping the lane free. They weren't sieging any other provinces and their army was just one province away.
 

riknap

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I notice that they tend to target it, but not right away. In a protracted war, and if their focus is set to aggressive, they'll tend to siege the target "eventually", IF the "conditions are right" (ie. there are no enemy armies and/or battles in the campaign theater). otherwise, they tend to either stay away from the wargoal if there's an enemy stack nearby (unless your forces are also mostly nearby).

What about non vassals?

ditto for non-vassals. more accurately, non-vassals/subjects by default have a "no focus" stance, which means whether they focus on sieging or support is up to the AI completely. what influences this however is not exactly transparent though (since it's the AI behavior after all).