Death in the trenches were a constant companion to those serving in the line, even when no raid or attacked was launched or defended against. In busy sectors the constant shellfire directed by the enemy brought on random death, it didn't matter whether their victims were lounging around in a trench or laying in a dugout. Similar novices were also cautioned to, like the parapet of the trench of No Man's Land. Many men died on their first day on the trenches because of the sniper bullets precisely aimed at the trenches. It has been estimated that up to one third of allied casualties on the Western Front were actually kept in the trenches. Besides all the injuries, diseases were a heavy toll.
Rat infestation was the worst, their were over a million rats infested in the trenches. There were 2 main types of rats the black and brown rat.. Both were equally despised but the brown rat was especially feared. Goring themselves on human flesh