Beginning with the origins of the conflict.
Hope of a quick victory vanished as armies resorted to trench warfare.
With deadlock in the trenches, the great powers searched for other ways to break through.
The battles of Verdun, the Somme and Passchendaele were three of the worst of the war.
By the start of 1917, the strain of war was so great that half the French army mutinied.
A look at poverty in Germany, how the Americans finally joined in and how the war ended.
How the unfair treatment of the defeated Germans and Austrians gave rise to future unrest.