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.
Poster times the Hungarian Soviet Republic (led by Bela Kun), 1919: "You're hiding in the dark, a distributor of rumors - a counter-revolutionary - tremble!" "Ты, прячущийся в темноте распространитель слухов - контрреволюционер - трепещи!"