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Try and maintain the Crusading state as long as you feel possible (have your general leave the crusade one turn, rejoin it the next should prevent desertion, even if you do not make any progress towards the Crusade goal... You'll still have message of men threatening to leave but if you join back again, all will be forgotten...)
How do you leave then rejoin a crusading army? Are there time limits on crusades? Does crusading an excommunicated enemy reduce favor from other factions? Would repeated crusades against cities/castles be a viable option? Also, taking cities along the way that aren't the target of the crusade, how would that work?