Once it is established where the stone lands damage can be worked out. Any model that lies completely under the template is hit automatically - models whose bases lie partially under the template are hit on a 4+. See the diagram below for details.
You will have to use your judgement and common sense to decide exactly which models lie under the template - sometimes it is not easy to judge precisely.
Once it has been worked out which models are struck, work out damage in the usual way. Roll for each target to see whether it has suffered damage. Stone throwers have a Strength of 4 or more, so they cause damage on the roll of a 3+ or 4+ against most human or similarly sized targets. Refer to the To Wound chart for details. A damaging hit from a stone thrower causes D6 wounds, but as most creatures have only 1 Wound it is not necessary to take this dice roll. It is, however, useful when attacking characters and big monsters.
Any single model which lies directly at the centre of the template suffers 1 automatic hit at twice the stone thrower's usual Strength - the stone lands directly on top of that model. This means that a stone thrower can potentially slay even a large monster or a powerful character.
No armour saving throw is permitted against wounds from a stone thrower. When a big rock lands on you, you are squashed regardless of what armour you may be wearing! Ward saves may be taken as normal.