catflap.org Online Dictionary Query

  mortar fire
       n : artillery fire delivered by a mortar

  mortar fire /mˈɔːtə fˈaɪə/
  Mörserfeuer , Mörserbeschuss 
     Synonym: mortaring
  
   see: fire, interdiction fire, grazing fire, sustained fire, preparation fire, distributed fire, flak, aerial barrage, magazine fire, rocket fire, running fire, plunging fire, harassing fire, concentrated fire, light fire, sporadic fire, radar fire, cease fire, Fire at will!, friendly fire, direct fire, direct fire, indirect fire