First World War, Belgium, 1915. A French pilot, after a failed attempt to attack a German Zeppelin hangar in Haren, made an emergency landing over friendly territory and got his biplane stuck vertically in a tree. Soldiers are climbing up the tree. Fotocollectie Het Leven (1906-1941) of Spaarnestad Photo, n° SFA001017873, kept at Nationaal Archief