If a unit of creatures with more than 1 Wound on their profile is hit by a weapon that causes multiple wounds, determine how many wounds are caused on each model individually. Add up all wounds caused on the unit and then remove the appropriate number of models, noting any spare wounds on the unit. This method is also applied if such a unit is attacked by a spell or weapon that causes a hit on every model in the unit.
For example, a unit of Ogres (3 Wounds each) is hit by a cannon ball, causing 4 Wounds on a single model. This will cause 3 Wounds on the unit, with the fourth wound being discarded as no single model in the unit can suffer more Wounds than there are on their profile. Note that if the unit would have had any wounded rank and file models in it before getting hit by the cannon ball, the cannon ball is always assumed to have hit a rank and file model with their starting number of Wounds for the purpose of resolving casualties.