Kytheros wrote:It depends on how one defines "all out warfare".
If you're willing to accept total war - and all the civilian casualties that implies, the GA could, in theory, eliminate the League as a functioning entity by destroying planetary populations wholesale. Unfortunately, once you start that path, you have to completely finish it - and that would involve killing off a rather massive percentage of the entire human race, and putting picket forces in the formerly inhabited systems for some time to get anyone who was in transit between systems. Also, once you start that path, you have to be ever-watchful for somebody trying something similar against you, whether for revenge or because they just don't like you.
For some reason, I rather doubt that the GA is going to take that option.
The 'best' option that Manticore and the GA has is to break the League into a series of much smaller successor states without inspiring a lasting hatred of Manticore and the GA that could lead to widespread revanchist tendencies.
And, frankly, things have gone far enough that Manticore and the GA has to break up the League, no matter what the League and the Mandarins do, as a survival imperative - leaving the League intact now means that in a couple decades at most, the League can do the same sort of thing to Manticore and the GA that Theisman and Haven did to Manticore with Bolthole and Operation Thunderbolt, only on a larger and more devastating scale.
I would define the best stratagy as warfare against only the SLN. Under no circumstances should any civilian structure be touched, and that includes shipyards building civilian ships.
To give you an example, if North Korea declares war against the US, and destroys a bunch of US warships in Seoul harbor, there is a chance that South Korea might not declare war. If North Korea destroyed an army base and thousands of south Koreans die, nothing will stop south Korea from joining the fight.