If I have a powerful but far-off ally who asks me to join their war at a moment when I'm too busy with my own wars, is there any disadvantage to accepting their call for help but then never actually sending troops to help? Will my ally be offended in any way? Will they be more pleased if I actually do send help?
I know that there are certain intrigue options that become unavailable if you're at war, but let's assume that I'm already at war and ignore that aspect…
Best Answer
As far as I can tell, the only opinion boost you receive is when you say yes. Your actual "contribution" is only relevant for prestige.
The one thing you need to be careful of though, especially if you're fighting another war and need your troops to win that one, is if the person you're joining the war against is nearby and much more powerful than you. If they're not either, you're probably fine.