A model can fight if its base is touching the base of an enemy model. Even models attacked in the side or rear may fight, and if you wish they may be temporarily turned in the ranks to indicate they are doing so.

If a model is touching more than one enemy it can choose which to attack. If a model has more than 1 attack, it can divide its attacks as the player wishes so long as he makes this clear before rolling to hit. For example, if faced with an enemy hero and an ordinary enemy trooper you might decide to attack the trooper because he is easier to kill, or you could take the outside chance of slaying the hero.

In the case of cavalry mounts that have their own attacks, the rider's attack and the mount's attack are worked out separately. This means that some cavalry have two lots of attacks: the rider attacks and his mount attacks as well. For example, warhorses and giant wolves have their own attack.