Not every creature in the armies of the Vampire Counts is technically one of the living dead, but all are bound to the will and magical power of their sorcerers. All units with the Undead special rule are Unbreakable, Unstable and cause Fear, as described in the Warhammer rulebook. In addition, units with the Undead special rule cannot make march moves unless they are within 12" of the army General (or have the Vampiric special rule), in which case they can march as usual. Lastly, when a unit with the Undead special rule is charged, it can only elect to hold.