The details this passage actually reveal about the horrors of trench warfare is that it actually leads to bombardment, curtain-fire, attacks and use of machine-guns.
What is trench warfare?
Trench warfare is actually known to be a kind of warfare on land that uses military trenches where troops enter to be protected from the enemy's small arms and sheltered from their artillery.
We see that it is revealed from the passage that there was bombardment and casualties as well.
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