It depends on the perspective you look at it from. Soldiers desrcibed that they "didn't think about it" relating to killing other people. This action appears cold and remorseless to outsiders, but to soldiers, it was quite normal. During WW1, a new state emerged originally called "Shell Shock". It was re-named Battle Fatigue during the Second World War, and after once again renamed Combat Stress Reaction.
Shell Shock happened when a soldier was overwhelmed with his surroundings during war. Symptons included slowness of thought, and soldiers falling apart basically. This was one mental state that soldiers faced.
The disturbed mental state generally came after the war, and after the soldiers had returned home. Then mental unstability generally came over the soldiers.
However, during the war reports said soldiers on the front line could even appear normal, as if it had not affected them.
Yes, many men fought in the world war 1. There were soldiers as well as ordinary men.
the men werent there at the time
The men were fighting in the wars.
world war 2
Over 200,000 men died in the trenches of World War 1.
how did world war one affect the relations between men and women? how did world war one affect the relations between men and women?
Over 450 soldiers died. Many U.S men and women were injured and killed. 
When the men started war
Because young men are stronger and old men are weaker
The state of Illinois lost 2,929 men killed in the Vietnam War. The website Vietnam War Casualties by state, lists those men by name, state, and city/district.
The state of Washington sacrificed 1,050 men in the Vietnam War.
they fought