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"If friends of equal or better morale grade break within 6", go down a morale level (steady to unsteady to routed). Ignore lesser breeds breaking."
The ACW expansion to R&F extends the rules around leaders and recommends their use for other eras also...The "Old Guard" morale rule is a good one and I have seen it used for rules in all eras, it just falls foul of the "law of unintended circumstances" when used by certain types of players.