In short
On June 28, 1914, Archduke Franz Ferdinand of Austria-Hungary was assassinated in Sarajevo by Serbian nationalist Gavrilo Princip. The event triggered a chain of alliance obligations—Austria-Hungary declared war on Serbia, Russia mobilized to defend Serbia, Germany declared war on Russia and France, and Britain entered when Germany invaded Belgium. Within weeks, most of Europe was at war.
How it unfolded.
The five-minute version
What actually happened.
World War I, or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Major areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. The war saw important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 15 to 22 million military and civilian casualties and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.
As it was happening
20 voices, 1830 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Assassination in Sarajevo
Archduke Franz Ferdinand of Austria-Hungary and his wife Sophie are shot dead by Gavrilo Princip in Sarajevo. The event triggers a diplomatic crisis across European alliance networks.
Voices from this moment (3)
Personal correspondence, Vienna Imperial Archives
Jun 24
“I go to Sarajevo with the gravest misgivings.”
The Manchester Guardian, July 1914
Jul 15
“A great war in Europe would bankrupt every belligerent.”
Assassination in Sarajevo
Jun 28
“Archduke Franz Ferdinand of Austria-Hungary and his wife…”
As it was happening
20 voices, 1830 days.
Day 4 · June 28, 1914
Assassination in Sarajevo
Archduke Franz Ferdinand of Austria-Hungary and his wife Sophie are shot dead by Gavrilo Princip in Sarajevo. The event triggers a diplomatic crisis across European alliance networks.
“I go to Sarajevo with the gravest misgivings.”
- Personal correspondence, Vienna Imperial Archives, Jun 24
“A great war in Europe would bankrupt every belligerent.”
- The Manchester Guardian, July 1914, Jul 15
“Archduke Franz Ferdinand of Austria-Hungary and his wife…”
- Assassination in Sarajevo, Jun 28
Day 29 · July 23, 1914
Austria-Hungary issues ultimatum to Serbia
Austria-Hungary demands Serbia suppress nationalist organizations and allow Austro-Hungarian officials to investigate the assassination. Serbia rejects key demands.
“Austria-Hungary demands Serbia suppress nationalist…”
- Austria-Hungary issues ultimatum to Serbia, Jul 23
Day 34 · July 28, 1914
Austria-Hungary declares war on Serbia
Austria-Hungary formally declares war, beginning the cascade that pulls Europe's major powers into conflict through mutual defense treaties.
“Austria-Hungary Declares War on Serbia”
- The Times, Jul 28
“Austria-Hungary formally declares war, beginning the…”
- Austria-Hungary declares war on Serbia, Jul 28
Day 38 · August 1, 1914
Germany declares war on Russia
Germany declares war on Russia in response to Russian mobilization supporting Serbia. France begins mobilizing in response.
“FR: 'La Mobilisation Generale' / EN: General Mobilization…”
- Le Figaro, Aug 1
“DE: 'Deutschland Mobilisiert gegen Doppeleinkreisung' / EN:…”
- Berliner Tageblatt, Aug 2
“Germany declares war on Russia in response to Russian…”
- Germany declares war on Russia, Aug 1
Day 40 · August 3, 1914
Germany declares war on France
Germany declares war on France and invades Belgium. The invasion of neutral Belgium brings Britain into the war the following day.
“Germany declares war on France and invades Belgium.”
- Germany declares war on France, Aug 3
Day 41 · August 4, 1914
Britain declares war on Germany
Britain declares war on Germany over the invasion of Belgium, honoring its treaty obligations. Most of Europe's major powers are now at war.
“You will be home before the leaves fall from the trees.”
- Imperial proclamation to the German Army, August 1914, Aug 4
“Europe Plunges Into War; Four Great Powers at Grips”
- The New York Times, Aug 5
“The Great War Begins - Britain's Ultimatum to Germany…”
- The Daily Telegraph, Aug 5
“War fever has gripped the nations.”
- Synthesized from period accounts - The Cambridge Magazine and private letters, August 1914, Aug 10
“FR: 'L'Allemagne a franchi le Rubicon.”
- L'Intransigeant, August 1914, Aug 5
“Britain declares war on Germany over the invasion of…”
- Britain declares war on Germany, Aug 4
Day 73 · September 5, 1914
First Battle of the Marne
Fighting near Paris halts the German advance into France. The battle establishes the static trench warfare that will define the Western Front for four years.
“Fighting near Paris halts the German advance into France.”
- First Battle of the Marne, Sep 5
Day 607 · February 21, 1916
Battle of Verdun begins
Germany attacks French forces at Verdun. The battle lasts 10 months and kills approximately 700,000 combined, with minimal territorial change.
“Germany attacks French forces at Verdun.”
- Battle of Verdun begins, Feb 21
Day 1017 · April 6, 1917
United States declares war
The US declares war on Germany following Germany's resumption of unrestricted submarine warfare and the Zimmermann Telegram affair. American forces begin arriving in Europe in summer.
Day 1601 · November 11, 1918
Armistice signed
Germany signs armistice with Allies at 11 AM on November 11. Fighting ceases after four years and four months. Terms require German military withdrawal and demilitarization.
“Germany signs armistice with Allies at 11 AM on November 11.”
- Armistice signed, Nov 11
Day 1830 · June 28, 1919
Treaty of Versailles signed
Germany signs peace treaty exactly five years after Franz Ferdinand's assassination. Treaty imposes reparations, territorial losses, and military restrictions that fuel resentment for two decades.
“Germany signs peace treaty exactly five years after Franz…”
- Treaty of Versailles signed, Jun 28
Front pages.
3 outlets carried the story: The Times, Le Figaro, The New York Times.
Media coverage
What the world was reading.
5 pieces, ranked by how much they shaped the discourse.
The Times
Newspaper · United Kingdom · Jul 28, 1914
"Austria-Hungary Declares War on Serbia"
Austria-Hungary has formally declared war on Serbia following the assassination of Archduke Franz Ferdinand in Sarajevo. The declaration marks a critical escalation in the Balkan crisis and threatens to draw the great powers into direct conflict.
- Aug 5, 1914
The New York Times
Newspaper · United States
"Europe Plunges Into War; Four Great Powers at Grips"
Synthesized from period reporting - Britain has declared war on Germany as the continental powers engage in open conflict. The outbreak of hostilities has sent shockwaves through financial markets and poses grave consequences for American trade and neutrality.
- Aug 5, 1914
The Daily Telegraph
Newspaper · United Kingdom
"The Great War Begins - Britain's Ultimatum to Germany Expires"
Synthesized from period reporting - Britain's ultimatum demanding German withdrawal from Belgium has expired without response. The nation is now at war with Germany, and recruiting officers report unprecedented volunteer enlistment across the country.
- Aug 1, 1914
Le Figaro
Newspaper · France
"FR: 'La Mobilisation Generale' / EN: General Mobilization Ordered"
FR: 'Le Gouvernement Francais ordonne la mobilisation generale de toutes les forces armees.' / EN: The French government has ordered the general mobilization of all armed forces in response to German military preparations. Reservists are being called to the colors across the nation.
- Aug 2, 1914
Berliner Tageblatt
Newspaper · Germany
"DE: 'Deutschland Mobilisiert gegen Doppeleinkreisung' / EN: Germany Mobilizes Against Encirclement"
DE: 'Die deutsche Armee bereitet sich vor, gegen die Bedrohung durch Frankreich und Russland zu handeln.' / EN: The German military prepares to act against the threat posed by France and Russia. Official statements stress the defensive nature of German mobilization.
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Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.Outbreak of World War I
en.wikipedia.org