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A trench box in use with chains still attached and a ladder in place. Trench shields (also called trench boxes or trench sheets) are steel or aluminum structures used to avoid cave-ins and protect utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by ...
Trench shoring is the process of bracing the walls of a trench to prevent collapse and cave-ins. The phrase can also be used as a noun to refer to the materials used ...
They may be part of a trench system, form an interlocking line of defence with other pillboxes by providing covering fire to each other (defence in depth), or they may be placed to guard strategic structures such as bridges and jetties. Pillboxes are hard to defeat and require artillery, anti-tank weapons or grenades to overcome.
A box crib is the simplest, most stable and most common method of cribbing. It is constructed by arranging sets (two or more) of matched blocks in a regular log-cabin style to form a rising square or rectangular frame. The more blocks on each level, the greater the number of support points and therefore the greater the strength of the crib tower.
In British and Canadian military argot it equates to a range of terms including slit trench, or fire trench (a trench deep enough for a soldier to stand in), a sangar (sandbagged fire position above ground) or shell scrape (a shallow depression that affords protection in the prone position), or simply—but less accurately—as a "trench".
No details are available concerning the MP 18/II, however it is known that the MP 18/III and the MP 18/IV both fed from a straight, 90° magazine feed which took Mauser pattern box magazines, of the same type used in Mauser's experimental C06/08 pistol and C17 'Trench Carbine' (the latter was possibly a rival to the MP 18/I) and later the SIG ...