Russian trenches in the mountains of Galicia, World War I, 1915, (1929).Artist: Stuff [Getty Images]

Russian trenches in the mountains of Galicia, World War I, 1915, (1929). The Russians advanced into Galicia after defeating the Austro-Hungarian army in the early months of the war but were forced to retreat by a combined German and Austro-Hungarian offensive in the spring and summer of 1915. (Photo by The Print Collector/Print Collector/Getty Images)

Hulton Archive Print Collector