society > armed hostility > defence > defensive work(s) > shelter or screen > [noun] > pits
rifle pit1856
shelter-pit1870
gun-pit1877
1870 Instr. Mil. Engin. §513 It may be necessary [for men skirmishing] to dig small pits, which may be called shelter pits in contradistinction to the larger pits..called rifle pits. Each shelter pit should be for one man only.