Most cavalry models (but by no means all) consist of not one, but two models – rider and mount, together making a single model. To represent this, many cavalry models have a split profile. In game terms, this works as follows:
Unless noted otherwise, any special rules that apply to one element (rider or mount) apply to the other as well.
The rider and mount each use their own Weapon Skill, Ballistic Skill, Strength, Initiative and Attacks characteristics, and their own weapons.
In combat, all enemy rolls To Hit are made against the rider's Weapon Skill.
Impact Hits and/or Stomp Attacks use the mount's Strength.
When this model makes an Armour Save roll, it uses the rider's armour value.
If the rider is reduced to zero Wounds, the model as a whole is removed from play.