#10 Unidentified pilot wearing a type of breathing apparatus, taken at Hazelhurst Field, Long Island, New York.

Unidentified pilot wearing a type of breathing apparatus, taken at Hazelhurst Field, Long Island, New York.

Knights of the Sky, Cages of Death: The Brutal Evolution of WWI Air Combat

#10 Unidentified pilot wearing a type of breathing apparatus, taken at Hazelhurst Field, Long Island, New York.

WWI

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#2 Austrian forces watch the front line from a high point. 1917.

#19 An observer is disentangled from a tree after parachuting from his balloon, 1918.

#56 1920s Berlin: 50+ Historical Photos Showing Everyday Life In Berlin After World War I #56 WWI

#12 An observation balloon is prepared for ascent in Ypres, Belgium, 1917.

#45 Young women from Lowell, Massachusetts, forming America’s first Women’s Death Battalion, 1917.

#17 Russian nurse, 1916

#29 The heroes of Drie Grachten: five soldiers, officers and soldiers, Belgium, 1917.

#7 Fabulous Studio Portraits of German Soldiers with Flowers, 1910s #7 WWI

#34 British troops sort through the belongings of German prisoners in a trench.