Psychological dangers of trenches included shell shock, which was caused by noise, danger of death, friends and family dying, fear, mutilation of bodies around you and the disgusting sights.
Pals battalions were quickly abolished as many men from one village were wiped out in one go at certain battlefields, for example the battle of the somme.
Conscientious objectors, also known as conchies, were people who refused to fight due to religion, political views, feeling like they couldn't murder or they believed it was a denial of their freedom.
Conditions in the trenches were terrible, there were lots of rats who ate ratons, crawled on sleeping soldiers, carried disease and were as big as cats.
Due to the slow pacing of the war and massive amount of casualties this was known as a war of attrition (wearing down enemies to the point of defeat by continuously attacking their forces until they are exhausted and cannot continue).
Trench foot was a condition where the flesh on your foot would swell up due to the constant moisture and rot the flesh, in severe cases amputation had to be considered.
The battle started with a week long bombardment where 1738000 shells were fired which Haig believed would destroy Germans, their fire arms and the barbed wire, this bombardment failed as many shells failed to detonate or missed aswell as the fact Germans hid in their deep dug out and remained unharmed, the barbed wire also failed to be destroyed and the shells only tangled it further.