Damage is resolved differently depending on whether or not the cannon ball hits a model directly or not. Normal Cannons have both the Multiple Wounds (D6) and (D3) special rules. It inflicts D6 Wounds only if the cannon ball lands directly on a model (that is, where the marker is placed after the first artillery and scatter dice are rolled), models hit by the bounce only suffer D3 Wounds. Great Cannons on the other hand, inflicts D6 Wounds on both direct hits and the bounce.