Discusses World War I, the relationships among nations, modern weaponry, military decisions, and how the seeds of a second world war were sown.

Murder in Sarajevo -- Armed to the teeth -- To Berlin! To Paris! -- "The most terrible August in the history of the world" -- Stalemate -- The technology of death and destruction -- Life and death in the trenches -- Over the top -- The Battle of Verdun -- The Battle of the Somme -- The war at sea -- Mutiny, revolution, and the collapse of armies -- "Lafayette, we are here!" America joins the fight -- The last offensive and the collapse of empires -- Losing the peace.