28 July 1914: Austria-Hungary Declares War on Serbia Starting WWI
On July 28, 1914, exactly one month after the assassination of Archduke Franz Ferdinand in Sarajevo, Austria-Hungary declared war on Serbia, setting in motion a catastrophic chain of events that would engulf the world in the deadliest conflict humanity had ever known. World War I had begun.
The assassination of Franz Ferdinand on June 28 by Gavrilo Princip, a Bosnian Serb nationalist, provided Austria-Hungary with a pretext to crush Serbian independence once and for all. The empires leaders believed that Serbia had sponsored the assassination plot and saw an opportunity to eliminate what they viewed as a troublesome neighbor that threatened the stability of their multi-ethnic state.
On July 23, Austria-Hungary delivered an ultimatum to Serbia containing demands so extreme that they were designed to be rejected. Serbias surprisingly conciliatory response accepted most of the demands but balked at allowing Austrian officials to conduct investigations on Serbian soil. This was enough for Vienna. Five days later, Austria-Hungary declared war and began bombarding Belgrade.
The declaration of war activated a web of alliances and mobilization plans that transformed a regional conflict into a world war with stunning speed. Russia, bound by Slavic solidarity and strategic interest to protect Serbia, began mobilizing its massive army. Germany, allied with Austria-Hungary, demanded that Russia halt mobilization and declared war when the ultimatum was ignored. France, allied with Russia, was drawn in next. When Germany invaded neutral Belgium to attack France, Britain entered the war as well.
Within six weeks of Franz Ferdinands assassination, the major powers of Europe were locked in total war. What leaders on all sides expected to be a short, decisive conflict instead became four years of unprecedented carnage. The war introduced industrialized slaughter on a scale never before imagined, with machine guns, artillery, poison gas, and trench warfare creating killing fields that consumed an entire generation of young men.
By the time the armistice was signed on November 11, 1918, approximately 17 million soldiers and civilians had died, empires had collapsed, and the political map of Europe had been redrawn. The wars unresolved tensions and punitive peace settlement would plant the seeds for an even more devastating conflict just two decades later. July 28, 1914, thus marks one of the most fateful days in human history, the moment when the old world order began its violent destruction.
