France loses the Franco-Prussian War and the Paris Commune rises and falls
Defeat at Sedan brings down an empire and ignites a workers' uprising
Quick facts
- Location
- Sedan and Paris, France
- Result
- German victory; Alsace-Lorraine annexed
- Aftermath
- Paris Commune, March-May 1871
What happened
Prussia and its German allies decisively defeated Napoleon III's army at the Battle of Sedan on 1-2 September 1870, capturing the emperor himself along with over 100,000 troops and effectively deciding the Franco-Prussian War. The Second Empire collapsed within days, and a new Government of National Defense continued the war until Paris, under siege, agreed to an armistice in early 1871. Radical Parisians, angry at the peace terms and the new conservative National Assembly, rose up in March 1871 and formed the Paris Commune, a socialist and revolutionary city government that the French army suppressed in the bloody Semaine Sanglante of late May, killing thousands of Communards.
Why it matters
The war's loss cost France the border provinces of Alsace and Lorraine to the new German Empire, a humiliation that fed French nationalism for the next fifty years, while the Commune's suppression left a lasting fracture in French politics between conservative and revolutionary left-wing traditions.
How we know
Military reports, diplomatic correspondence, and the Commune's own official records and newspapers survive, and the Library of Congress holds a dedicated research guide compiling primary sources on both the war and the Commune's rise and fall.
Sources
- Library of Congress Research Guides. The Paris Commune and the Franco-Prussian War of 1871 · Primary sourceguides.loc.gov · The domain "guides.loc.gov" is on our Primary source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Fondation Napoleon. Timeline: the 2nd French Republique and the 2nd Empire · Unclassified sourcenapoleon.org · Cited as a "website" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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