The Necessary War is a documentary about WWI, produced by BBC

In this documentary author answers on the question - what was the role of United Kingdom during WWI, and why did Britain enter on conflict with Germany over Belgium?

This year (2014) turns 100 years since WWI or how it was referred in the interwar period - The Great War escalated from the minor conflict in Balkans and took over all Europe for 4 years. 

Watch on YouTube