All my campaigns have been VH/VH.Originally Posted by the_inquisition
I think, as others have stated, it might be keyed to loyalty of provinces. Because I am very careful about keeping all of my provinces in the green/yellow: I trail invading forces with a peasant support army (and am constantly producing more peasants to bring to the warfront). And I always exterminate so that I'll have a full 80% order peasant garrison to leave behind.
I think it also may be keyed to size of army. As with bribe costs, the game might make it far less likely for a general to rebel if he has a massive force. (I tend to concentrate my forces)
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