Friday 1 July 2016 marked the centenary of the beginning of the Battle of the Somme, the biggest conflict seen on the Western Front during World War I. Here are some of the most arresting photos from the war. Contains graphic images.
The British Mark V tank was an upgraded version of the Mark IV tank, deployed in 1918 and used in action in the closing months of World War I, in the Allied intervention in the Russian Civil War on the White Russian side, and by the Red Army. Thanks to Walter Wilson's epicyclic gear steering system, it was the first British heavy tank that required only one man to steer it
The Most Powerful Images Of World War I
Magic moments marking 170 years of British photography
Men of 1/5th York and Lancaster Regiment in International Trench near the Yser Canal north of Ypres, 1915
The First World War was the first war in which manufactured poison gas was used as a weapon on a large scale. | The Most Powerful Images Of World War I. Note the man with the revolver. My great-uncle was affected by this gas for the rest of his life.