It' been months since I played M&B, but one thing I do remember is that you need to be really well prepared if you're planning to support a claimant. Investing in persuasion helps immensly since without a few lords on your side it's almost impossible to win. Also try and rebel at a time when Swadia is already at war with some other faction, that way brokering peace is easier.
And most importantly get knights of your own. That's the only surefire way to kill enemy knights in SP.
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