Vis a vis 9.42, the latter is correct. If two or more cavalry units attempt to charge Unit A, but only one is successful, the resolution of the combat is still handled as a successful Charge in terms of the Charge Column on the Superiority Chart. Post-Charge Disruption does not apply to Routed Units. Cavalry may pursue foot units. No Salvo Fire is allowed in the CM Phase.
Cavalry also retreats two hexes when first routed.
In determining distance for the dieroll, count the unit's hex, but not the leader's.