Bows and other weapons can loose their projectiles a high-arcing volley. Even warriors who cannot see the foe can contribute to the attack by following suit to their friends.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Weapons with this rule allow the unit to fire with all models within range in the Shooting Phase as long as at least one model in the unit can draw Line of Sight to the target. However, if they do so, they suffer -1 To Hit. A unit cannot Volley Fire if it moved earlier in the turn or if the target is within half the weapon's maximum range. Note that Volley Fire cannot be used as Stand & Shoot charge reaction.