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Aside the constant fear of being blown to pieces or machine gunned, disease, trench foot ( a kind of foot rot caused by constant damp or wet feet), drowning in mud, mental instability, stress, illness such as 'Spanish Influenza'.

During World War I, the soldiers on both sides faced many challenges. There was always the threat of mustard (poison) gas, extreme temperatures, both hot and cold, dampness, inclement weather, infections, diseases, hunger,grenades and artillery fire being lobbed into the trenches, enemy onslaughts culminating in hand to hand combat, etc. That war was unlike any other war that had fought in history, because of the trench warfare concept.

Exposure to the elements possible cave -ins On The Eastern Front the water table was very high so the trenches were often flooded. and Trench Foot is caused by having wet feet for prolonged periods of time I think.

in trenches a lot of soldiers were forced to stay within trenches for days on end, in trenches there are still water still water breeds bacteria which caused many soldier to become sick with diseases that they were not immune to. they also fell victim to trench foot which was when the foot stayed wet for a period of time the bacteria in the water grow and infect the foot causing sores blisters and other non desirable things.

Mainly economical and resources. Germany had a powerful economic stand and also the technology to secretly build its arsenal. France wasn't much of a challenge, all they did was build a super fortress that took years to build on its eastern border, it took the germans a couple of hours of bombing to bring it down. Belgium and poland had no actual military resistance. The only country that made a significant stand in the western europe region was England. The U.S. was too far and most people here thought the war just wasn't ours. We were only sending supplies to England but some cargo ships and even some passenger ships were sunk by the German naval forces. Once we got involved, we had issues with logistics, we had only England and North Africa to stage our forces. and how to keep supplies lines open for our troops once they were inland. We had a long way to go, Germany had prepared years earlier. Good luck on your paper.

Disease,rats,shortages of food,and the fighting. The trenches would fill with water and mud in rainy weather. The shelling would cause them to cave in.

mustard gas

death

grenades

something else i think its called trench foot or something like that

Rats, disease, lice and more. See below.