Answer: trenches

AnswerCrossword Clue
TRENCHES

Where the real work gets done

TRENCHES

Battlefield ditches

TRENCHES

WWI defenses

TRENCHES
W. W. I lines
TRENCHES
W.W. I defences
TRENCHESFosses
TRENCHESW.W. I battlegrounds
TRENCHESW.W. I battle sites
TRENCHESInfantry lines
TRENCHESFoxholes
TRENCHESGIs' earthworks
TRENCHESTough workplace, figuratively
TRENCHESSoldiers' digs?