Source: The Great War in Pictures, No. 8 (1915): 21.

From Pursuit of an "unparalleled opportunity": American YMCA and prisoner of war diplomacy among the Central Power nations during World War I, 1914-1923 by Kenneth Steuer

Subjects
  • American: 1900-present
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  • An exterior view of the Citadel at Mainz, depicting Allied officers relaxing during the day. Source: The Great War in Pictures, No. 8 (1915): 21.