4 WWI DVDs: The Great War (2 discs) / Warbirds Over the Trenches Disc Two / The Century of Warfare

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The Great War - 1914 - 1918, A Year - By - Year Account of the War

Disc 1 - 110 minutes - covers 1914 and 1915

Disc 2 - 2 hours, 45 minutes - covers 1916, 1917, 1918

Warbirds Over The Trenches, Disc 2 - 2 hours, 29 minutes - 3 episodes:

The Great Zeppelins, Fighter Plane Advances, The Birth of the Giant Bomber

The Century of Warfare - 208 minutes - narrated by Robert Powell - 4 episodes including WWI naval and airplane warfare