A unit may be unable to charge its intended target without making contact with other enemy units. In such cases, the charging unit must declare a charge against all of the enemy units it will contact, and each is able to declare its own charge reaction.
If the charging unit is unable to align itself to all of the enemy units once contact has been made, those enemy units the charging unit cannot align against must themselves align against it. The charging unit counts as having made a disordered charge against any unit that was obliged to align against it.