Egypt sandbag HMG pit with NVG circa 1957

[Griefbringer]

Originally Posted by Mobhack

It represents many forms of technical means available to a defender of a fixed position that really do not need specific games rules that simply add unnecessary complications.

So - range cards, MGs firing along fixed lines, trip flares, tin cans tied to wires, Pte Snuffy's pet terrier barking, an individual (not on map) sentry wandering about or whatever.

Then there is also the usage of tracer ammunition. Not that it really helps with spotting the enemy, but at least you get an idea where the rounds are hitting home. And they look impressive, which might have a morale effect.