German officers stand near an observation balloon near the Western Front in 1915. This picture is part of a previously unpublished set of World War I images from a private collection obtained by London's Archive of Modern Conflict. The collection offers unusual views of the war, from crashed planes to sinking ships, and from officers partying in their headquarters to the grim reality of life and death in the trenches. The year 2014 marks the centenary of the start of the war.
A German Air Force officer sits astride a dead boar outside a house where he is stationed near the Western Front in 1918.
Officers of the Imperial German Air Service compete at a squadron athletics meeting near the Western Front in 1917.
The wreckage of a crashed German Friedrichshafen seaplane sticks out of a building in Germany in 1918.
A German U-boat sinks an Allied merchant vessel in the Atlantic Ocean in 1915.
An Allied aircraft flies over the Western Front in this undated photo.
Soldiers are dwarfed by Italian heavy artillery guns on the Italian Front in 1918.
Captured German prisoners lie down in a field in Longueau, France, on the Western Front, on Aug. 1, 1916.
Dead British soldiers lie on the ground at a machine gun position on the Western Front in 1918.
A German officer reads a book in a chateau where he is stationed near the Western Front in 1918.
U.S. soldiers model international gas mask designs at the Chemical Development Laboratory in Philadelphia in 1919.
German Air Force officers throw a party at a house where they are stationed near the Western Front in 1918.
Women work at the Brewery Road Works munitions factory in England in 1916.