WordNet (r) 3.0 (2006):

shellfire
    n 1: shooting artillery shells

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "shellfire":
   antiaircraft fire, cross fire, curtain fire, direct fire, dry fire,
   file fire, fire, fire of demolition, firepower, fireworks, firing,
   flack, flak, ground fire, gunfight, gunfire, gunplay,
   high-angle fire, horizontal fire, interdiction fire,
   machine-gun fire, mortar fire, musketry, percussion fire,
   pistol fire, raking fire, rapid fire, ricochet fire, rifle fire,
   shoot-out, shooting, time fire, vertical fire, zone fire