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A brief outline of the major battles of 1917-1918 and their significance...
Arras, 1917 - An overview of the battle
Third Ypres (Passchendaele) - An overview of Third Ypres
The battlefield today
Cambrai, 1917 -
An overview of the Battle of Cambrai
An article challenging the 'myth' of Cambrai
Spring Offensive (Kaiserschlact), March 1918
An overview of the German attack
A film about the Spring Offensive (Part 1 of 4)
Amiens, 1918 and the 100 day advance
Battle of Amiens
100 day adavnce
A good summary of the nature of the British Army by 1918 -
http://www.bbc.co.uk/history/worldwars/wwone/gallery_tactics.shtml
Also see videos in WW1 quick links section...