From Wiktionary, the free dictionary
fire bay (plural fire bays)
- (military) A trench, or section of a trench, with a concealed parapet from which soldiers can fire on the enemy.
1929, Frederic Manning, The Middle Parts of Fortune, Vintage, published 2014, page 219:Presently Corporal Hamley motioned him forward into the next fire-bay.
1991, Pat Barker, Regeneration (The Regeneration Trilogy), Penguin, published 2014, page 138:In the third fire bay he found Sawdon and Towers crouched down over a small fire made out of shredded sandbags and candle ends, coaxing the flames.
