The July Crisis triggered the chain of mobilizations and declarations of war that transformed a regional dispute into World War I by early August 1914.
Key Facts
- Crisis start date
- 28 June 1914 (assassination of Franz Ferdinand)
- Austrian ultimatum to Serbia
- 23 July 1914
- Britain entered the war
- 4 August 1914
- German guarantee to Austria
- Known as the 'blank cheque'
- Assassination perpetrator
- Gavrilo Princip, Bosnian Serb nationalist
- Victim of assassination
- Archduke Franz Ferdinand and Sophie, Duchess of Hohenberg
By the Numbers
Location
Cause → Event → Consequence
On 28 June 1914, Gavrilo Princip assassinated Archduke Franz Ferdinand, heir presumptive to the Austro-Hungarian throne, and his wife Sophie. Austria-Hungary sought to use the incident to deliver a military blow against Serbia and suppress Yugoslav nationalism, securing Germany's unconditional backing — the so-called 'blank cheque' — before acting.
Austria-Hungary issued a deliberately harsh ultimatum to Serbia on 23 July 1914. Russia began secret mobilization preparations in support of Serbia, alarming Germany. A complex web of alliances drew in France, and Britain — fearing German dominance of the continent — entered the war on 4 August, partly citing the German invasion of Belgium.
The crisis ended with most major European powers at war by early August 1914, marking the outbreak of World War I. The assassination that nominally started the crisis had become a footnote to a broader continental conflict driven by alliance obligations, imperial rivalries, and the miscalculations of political and military leaders across Europe.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Side B
4 belligerents