HRE confusion

[Entelin]

Under what circumstances can I go to war with an HRE member without being attacked by the emperor (austria)? I'm noticing that various HRE members seem to attack each other without attracting austria's attention?

Also is there a map mode where I can see attitudes twords me?

 

[Decimal]

The emperor will most likely join unless he is totally overrun (and then he will still sometimes join). If you are outside the HRE you either have to be big, or wait for a very opportunistic time (silver star the emperor and wait for him to be deep in a war).

If you are in the HRE I think that you can attack without the emperor intervening directly in the war (although he may ask you to return non-cored provinces).

 

[Yavanion]

you can also look at your target nation in HRE if that nation is allied with a nation that is outside of the HRE, for example in the demo as Venice, i attacked Naples, Papacy, Umbria, to get tuscana, siena as a exampel into the war

 

[unmerged(168499)]

As long as you have legit CB you should be able to declare war on any other HRE member provided you are a member as well. If you're not a member the emperor will always get a call to arms.