Key Facts
- Duration
- 4 years, 3 months (1914–1918)
- Estimated casualties
- 15–22 million military and civilian
- Fronts
- Western Front, Eastern Front, Middle East, Africa, Asia-Pacific
- Empires dissolved
- Russian, German, Austro-Hungarian, Ottoman
- New states created
- Poland, Finland, Czechoslovakia, Yugoslavia, Baltic states
Strategic Narrative Overview
Germany's plan to quickly defeat France failed when its advance was halted in September 1914, producing a static Western Front of trenches stretching from the English Channel to Switzerland. Massive battles at Verdun, the Somme, and Passchendaele caused enormous losses without breaking the stalemate. The United States joined the Allies in April 1917. Russia's October Revolution led to a separate Soviet peace with the Central Powers in early 1918, freeing German forces for a spring offensive in the west that ultimately exhausted Germany's army.
01 / The Origins
The rise of the German Empire and decline of the Ottoman Empire unsettled Europe's balance of power, intensifying imperial rivalries and a major arms race among the great powers. Tensions in the Balkans provided the spark: on 28 June 1914, Bosnian Serb Gavrilo Princip assassinated Austro-Hungarian heir Franz Ferdinand. Austria-Hungary blamed Serbia and declared war; Russia mobilised in Serbia's defence, triggering a chain of alliances that drew Germany, France, Britain, and the Ottoman Empire into a widening conflict.
03 / The Outcome
The Allied Hundred Days Offensive from August 1918 collapsed the German front. Bulgaria, the Ottomans, and Austria-Hungary signed armistices in quick succession. Kaiser Wilhelm II abdicated on 9 November, and Germany signed the Armistice on 11 November 1918. The Paris Peace Conference imposed the Treaty of Versailles, stripping Germany of territory and imposing heavy reparations. Four empires dissolved, new states emerged across Europe, and the League of Nations was founded, though it failed to prevent a second global war by 1939.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Kaiser Wilhelm II, Erich von Falkenhayn, Paul von Hindenburg.
Side B
1 belligerent
Ferdinand Foch, Douglas Haig, Joseph Joffre.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.