Answer: trenches

AnswerCrossword Clue
TRENCHESWhere the real work gets done
TRENCHESBattlefield ditches
TRENCHESWWI defenses
TRENCHESW. W. I lines
TRENCHESW.W. I defences
TRENCHESFosses
TRENCHESW.W. I battlegrounds
TRENCHESW.W. I battle sites
TRENCHESInfantry lines
TRENCHESFoxholes
TRENCHESGIs' earthworks
TRENCHESTough workplace, figuratively
TRENCHESSoldiers' digs?
trencheslong, narrow ditch dug by soldiers for defense
trenchesdeep furrow or ditch
trenchesTRENCH, to dig a long, narrow ditch