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Declaration of War Austria-Hungary on Serbia, & Hostilities Between Allied & Cpcont Join now to read essay Declaration of War Austria-Hungary on Serbia, & Hostilities Between Allied & Cpcont WW IJuly28,1914, declarationofwar Austria-Hungary on Serbia,&hostilities between Allied & CPcont untl the signg of the armistice on November11,1918. Casualties land force amoun +37 mil close 10.