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Imagine if you dug a hole in your backyard 8 - 10 ft deep and put about 6 inches of water in it and a few rats. Imagine trying to sleep there. Then imagine being there while someone was shooting bullets and artillery shells at you all day long. Add to that the fear of knowing that sooner or later you would be ordered to 'go over the top' . Meaning you had to leave the protection of the trench cross 'no man's land' and attack the enemy trench while they're shooting machine guns and artillery at you. Add to that the terrible smells of war that you couldn't escape from, like the smell of dead and decaying bodies and human waste. The soldiers had to relieve themselves in the trenches also.
Imagine having to live like that day after day for a year or two or three...and then understand it was even worse than you can imagine.