units on the march.
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A cup trench is used to protect unburnt area during a fire when the fire is moving downhill. A cup trench will catch rolling material that is burning and stop it from moving towards the unburned area.
They were used for blasting people out of trenches.
They were used for hand to hand combat if the enemy jumped into their trenches. This was the first war with extensive use of trench warfare.
Periscopes were used in both WW1 and WW2. They were used on submarines and in the trenches. It was dangerous to look over the top of a trench so soldiers developed "trench periscopes".
Yes. But rarely.