Some interactive maps about WW1

The following are some interactive maps to study the stages and main military operations of World War 1. Click on the images to play the maps: 

- Europe plunges into war: it includes the explanation of Gavrilo Prinzip's terrorist attack and the evolution of the two sides during the war:

- From the BBC History website, the main battles in the Western front:

- A brief illustrated history of World War 1: it includes narration and subtitles: 

 - From the PBS website, a complete series of maps of the main military facts of the war in Europe