In EU3, you can actually start at the beginning of the League of Cambrai, with Austria, France, Aragon, and the Papal States all at war against poor Venice. However, the game doesn't allow for the backstabbing and shifting alliances that characterize the war. I believe Venice actually ends up getting in bed and allying with each of her enemies in the course of the war, and thereby managed to emerge from the war relatively unscathed.
http://en.wikipedia.org/wiki/War_of_the_League_of_Cambrai
I propose that a spy action of some sort be added that will allow third-party countries to weaken relations between two allied nations. Should relations fall below zero, the alliance breaks and the countries become more amendable to a peace deal. With sufficient improvement in relations, former enemies might even become allies in the same war. A template for this could be the current spy option available to merchant republics to weaken the relationship between rival merchant republics and their league members. Success effectively reduces relations by 50.
Just a thought.
http://en.wikipedia.org/wiki/War_of_the_League_of_Cambrai
I propose that a spy action of some sort be added that will allow third-party countries to weaken relations between two allied nations. Should relations fall below zero, the alliance breaks and the countries become more amendable to a peace deal. With sufficient improvement in relations, former enemies might even become allies in the same war. A template for this could be the current spy option available to merchant republics to weaken the relationship between rival merchant republics and their league members. Success effectively reduces relations by 50.
Just a thought.