'25 June 1916 - Serbia Day', French World War I poster, 1916. Artist: Theophile Alexandre Steinlen

'25 June 1916 - Serbia Day', French World War I poster, 1916. Artist: Theophile Alexandre Steinlen

1-276-913 - Art Media/Heritage Images

'25 June 1916 - Serbia Day', French World War I poster, 1916. Soldiers and civilians make their way across a snowy field. Serbia was conquered by the combined armies of Germany, Austria-Hungary and Bulgaria in 1915, suffering appalling military and civilian casualties in the process.

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