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The trenches weren't very nice places to be during World War I. There was lots of Disease in the trenches especially the British ones. Death was a constant companion to those serving in the line, even when no raid or attack was launched or defended against. In busy sectors the constant shellfire directed by the enemy brought random death, whether their victims were lounging in a trench or lying in a dugout(many men were buried as a consequence of such large shell-bursts). Similarly, novices were cautioned against their natural inclination to peer over the parapet of the trench into No Man's Land. Many men died on their first day in the trenches as a consequence of a precisely aimed sniper's bullet. It has been estimated that up to one third of Allied casualties on the Western Front were actually sustained in the trenches. Aside from enemy injuries, disease wrought a heavy toll.
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Rats in their millions infested trenches. There were two main types, the brown and the black rat. Both were despised but the brown rat was especially feared. Gorging themselves on human remains (grotesquely disfiguring them by eating their eyes and liver) they could grow to the size of a cat. Men, exasperated and afraid of these rats (which would even scamper across their faces in the dark), would attempt to rid the trenches of them by various methods: gunfire, with the bayonet, and even by clubbing them to death. It was futile however: a single rat couple could produce up to 900 offspring in a year, spreading infection and contaminating food. The rat problem remained for the duration of the war (although many veteran soldiers swore that rats sensed impending heavy enemy shellfire and consequently disappeared from view).
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Rats were by no means the only source of infection and nuisance. Lice were a never-ending problem, breeding in the seams of filthy clothing and causing men to itch unceasingly. Even when clothing was periodically washed and deloused, lice eggs invariably remained hidden in the seams; within a few hours of the clothes being re-worn the body heat generated would cause the eggs to hatch. Lice caused Trench Fever, a particularly painful disease that began suddenly with severe pain followed by high fever. Recovery - away from the trenches - took up to twelve weeks. Lice were not actually identified as the culprit of Trench Fever until 1918. Frogs by the score were found in shell holes covered in water; they were also found in the base of trenches. Slugs and horned beetles crowded the sides of the trench. Many men chose to shave their heads entirely to avoid another prevalent scourge: nits. Trench Foot was another medical condition peculiar to trench life. It was a fungal infection of the feet caused by cold, wet and unsanitary trench conditions. It could turn gangrenous and result in amputation. Trench Foot was more of a problem at the start of trench warfare, as conditions improved in 1915 it rapidly faded, although a trickle of cases continued throughout the war.