Portrait of a Group of Communard Soldiers Posing With Two Cannon at a Barricade During the Paris Commune (1871)

 Portrait of a group of Communard soldiers posing with two cannon at a barricade during the Paris Commune in Paris, France, 1871. Cabinet card-sized albumen print taken by photographer Bruno Braquehais.

Source: J. Paul Getty Museum.

Belgian Soldiers Guarding a Checkpoint Near Halen, Belgium (1914)

Belgian soldiers guarding a checkpoint near Halen, Belgium, shortly after the German invasion of Belgium, August 1914.

Source.

An American Soldier Firing a Chauchat Light Machine Gun From Behind a Barricade Made of Sandbags and Ammunition Boxes During World War 1 (1910's)

An American soldier firing a Chauchat light machine gun from behind a barricade made of sandbags and ammunition boxes during World War 1.