Which characters know about the "war"?

I know the upcoming "war" is going to be a major plotline for Season 6. I was wondering if the war was violent in nature such as a war between countries or strategic in nature like an athletic event or even a board game. That led me to wonder, which chacracters in Lost actually know there is an impending "war" about to take place. Maybe this will give us clues as to the nature and scale of the upcoming "war".

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