Austrian forces massacre civilians in Serbia.
Austrian forces crossed the Sava and seized Serbian town of Chabatz where a massacre of civilians occurred at the outset of world war one. (Photo by: Universal History Archive/UIG via Getty images)
Belgian soldiers found without uniforms on in front of a firing squad, WWI
Belgian soldiers found without uniforms on in front of a firing squad, WWI. 'This is a fate that every secret agent risks - death before a firing squad.' (Photo by Daily Herald Archive/National Science & Media Museum/SSPL via Getty Images)
erman Atrocities In Belgium: Execution By Machine Gun
German atrocities in Belgium: execution by machine gun, 1915. 'Atrocités Allemandes En Belgique: Exécutions à la mitrailleuse'. Civilians are shot by German soldiers during the First World War. Front cover of "Le Petit Journal Supplement Illustré". [France, 12 December 1915]. Artist Unknown. (Photo by The Print Collector via Getty Images)