World War I was the first modern global military conflict which took place in Europe between 1914 to 1918. Archaic military tactics met modern industrialised warfare for the first time, resulting casualties on a previously unimaginable scale. Men rotted in the mud, then were sent to face massed machine gun fire, modern artillary, tanks and chemical weapons. Approximately 16 million soldiers and civilians died and countless others were physically maimed or mentally scarred by the horrors of trench warfare.via sconicbomb
Music: Clint Mansell - The Last Man
And here is a video that shows the human toll of trench warfare. Warning this video is disturbing.