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Dnote

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Go to the diplomacy window for the country you want to start the Coalition against and it will be an option on there. I've yet to figure out if you can invite others to join you, I think they just decide that for themselves.

EDIT: Nvm, misread you :)
 

Commandante

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When any member of the coalition declares war on the coalition target all the coalition members get pulled in

I attacked an ally of a coalition target. The coalition target (Burgundy) rallied to defend its ally and declared war on me, which also seemed to trigger the coalition to attack Burgundy. Is this correct, or was the AI just opportunistic in this case?
 

Dnote

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I attacked an ally of a coalition target. The coalition target (Burgundy) rallied to defend its ally and declared war on me, which also seemed to trigger the coalition to attack Burgundy. Is this correct, or was the AI just opportunistic in this case?

Any conflict between target and coalition member should trigger all coalition members to war, regardless of how the conflict started.
 

BoleslavLev

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Somebody says coalitions are OP, but be also aware. I played Ironman Brandenburg and was in coalition against Hansa (the doom of Northern Germany at the beginning of the game). Bremen declared war on Hansa, I jumped in and couldn´t get out (naturally), but also, the box saying leader can give our provinces to anybody was ticked and couldn´t be unticked. Coalitions are great when you are a leader - you can just exploit every member :laugh: But when you are one of those members, it is rough.
 

Raen

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I made a coalition against France but I'm the only member so far. Will nations join on their own or do I have to invite them somehow? Don't see how if the latter.
 

Dnote

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I made a coalition against France but I'm the only member so far. Will nations join on their own or do I have to invite them somehow? Don't see how if the latter.

I've not found a way to invite. From what I've seen, members will come and go from a coalition depending on what the target does. If the target is aggressive or expansive, they will join, if the target doesn't expand towards a member for awhile they might leave... it isn't entirely clear what motivates the AI yet.
 

Pryderi

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Nations are leaving colaitions against me while I'm attacking someone for their land. It's pretty funny. Mind you my highest overextension in the whole game so far has been 32% since it's pointless to take big chunks of Orthadox land as rebel spam will drive you crazy.