Quote Originally Posted by White_eyes:D View Post
But you lose some Prestige.......I recall guaranteeing everyone around me as England....it made all my prestige which was 25 or so....to -5 when I choose not to....I didn't want to face Castille and France since I didn't have enough tech to blockade yet.

I only did it to make relations go up....not to fight a war I knew I would lose.
That's why you declare war on your own, THEN you click the Accept button on the Guarantee war declaration. That war won't occur separately because you're already at war with the target nation, and since you accepted you don't take the prestige loss.