It began as a regional conflict and escalated into a war of empires that covered the earth. Here is the complete 26 volume CBS News Series in four volumes.

Extra features: Disc 1. Great events before the war: 1910 - King Edward the VII dies -- 1911 - The South Pole is conquered -- 1912 - The Titanic disaster -- 1913 - The Panama Canal ; Disc 2. Up from the trenches ; Disc 3. Post war great events: 1920 - Prohibition -- 1920 - Suffrage -- 1921 - The Irish free state -- 1922 - Mussolini takes over.

vol. 1,The war begins -- vol. 2, The loss of innocence -- vol. 3, The tide of war turns. Vol. 1 : The war begins -- Vol. 2 : The Loss of Innocence -- Vol. 3 : The tide of war turns.