Bows and other weapons can loose their projectiles in a high-arcing volley. Even warriors who cannot see the foe can contribute to the attack by following suit to their friends.
Source: Warhammer Fantasy: 8th Edition
Volley FireURL Copied!
A unit with this special rule can choose to Volley Fire instead of making a normal shooting attack.
If it does so, half the models in the third and any subsequent ranks, rounding up, are allowed to shoot (in addition to the usual firing models in the front and second ranks). Models in rear ranks can use the line of sight and front arc of the first rank model directly to their front for the purposes of Volley Fire.
A unit cannot Volley Fire if it moved earlier in the turn, or as areaction.