| Date | 18 May 1803 – 20 November 1815 |
| Location | Europe, Egypt, North Africa, Atlantic Ocean, Indian Ocean |
| Caused by | Breakdown of the Peace of Amiens; French continental expansion; British refusal to evacuate Malta |
| Resulted in | Defeat and abdication of Napoleon Bonaparte; Congress of Vienna; dissolution of the Holy Roman Empire; restoration of Bourbon monarchy in France; Treaty of Paris (1815) |
| Parties | French Empire · Kingdom of Spain (Bonapartist) · Confederation of the Rhine · Kingdom of Italy · British Empire · Austrian Empire · Russian Empire · Kingdom of Prussia · Kingdom of Sweden · Kingdom of Portugal · Kingdom of Naples |
| Lead figures | Napoleon Bonaparte, Duke of Wellington, Tsar Alexander I, Emperor Francis II, Field Marshal Blücher, Admiral Horatio Nelson, Marshal Michel Ney |
The Napoleonic Wars were a series of major conflicts from 18 May 1803 to 20 November 1815, fought between the French Empire under Napoleon Bonaparte and a shifting coalition of European powers. The wars reshaped the political map of Europe, resulted in the dissolution of the Holy Roman Empire, and produced casualty figures estimated between three and six million soldiers, with civilian losses bringing the total considerably higher.
By 1799, France had endured a decade of revolutionary upheaval, external invasion, and internal counter-revolution. The coup of 18 Brumaire (9 November 1799) placed Napoleon Bonaparte, then a celebrated general of the Italian and Egyptian campaigns, at the head of the French state as First Consul. The Peace of Amiens, signed on 25 March 1802, provided a fourteen-month interlude of general peace between France and Britain, but the terms were regarded by both parties as a temporary arrangement rather than a permanent settlement. When Britain declined to evacuate Malta as stipulated and France continued its interference in Swiss and Italian affairs, hostilities resumed in May 1803.
The structural causes of the conflict ran deeper than any single diplomatic failure. France under Napoleon pursued a programme of continental hegemony that successive British governments regarded as incompatible with the European balance of power, a principle enshrined since the Peace of Westphalia in 1648. Prussia, Austria, and Russia each entered and exited successive coalitions as their strategic interests shifted, producing the characteristic rhythm of the wars: coalition, French victory, dissolution, regrouping. The Third Coalition, formed in 1805 following Napoleon's coronation as Emperor on 2 December 1804, was the first to confront him at the height of his military power.
### 1803–1805: The Third Coalition
The resumption of Anglo-French hostilities in May 1803 initially took the form of a naval blockade and the threat of French invasion across the English Channel. Napoleon assembled the Armée des Côtes de l'Océan at Boulogne, numbering approximately 180,000 men, throughout 1803 and 1804. The invasion plan was abandoned in August 1805 following the formation of the Third Coalition by Britain, Austria, Russia, Sweden, and Naples, and the destruction of the Franco-Spanish fleet at the Battle of Trafalgar on 21 October 1805. Though Nelson's victory at Trafalgar ended any immediate threat of French naval supremacy, Napoleon had already pivoted the Grande Armée eastward. At Austerlitz on 2 December 1805 — the first anniversary of his coronation — he defeated the combined Austrian and Russian armies in what is widely regarded as his most tactically complete victory, forcing Austria from the war by the Treaty of Pressburg on 26 December 1805.
### 1806–1807: Prussia and the Treaties of Tilsit
Prussia, which had remained neutral at Austerlitz, entered the war in October 1806 following French interference in northern Germany. The twin battles of Jena and Auerstedt on 14 October 1806 effectively destroyed the Prussian field army in a single day, and Napoleon entered Berlin on 27 October. The Berlin Decree of 21 November 1806 established the Continental System — a comprehensive trade blockade intended to strangle the British economy by closing European ports to British goods. The policy's long-term effect was to damage French-allied economies more severely than the British, a structural weakness that contributed materially to later coalition formation. The campaign against Russia concluded at the Battle of Friedland on 14 June 1807, after which Napoleon met Tsar Alexander I on a raft moored at the centre of the Niemen River at Tilsit. The resulting treaties, signed 7–9 July 1807, represented the apogee of French power in Europe.
### 1808–1814: The Peninsular War and Russian Campaign
The [Peninsular War](/wiki/peninsular-war) began in 1808 following Napoleon's installation of his brother Joseph on the Spanish throne, an act that provoked a national uprising and drew Britain into sustained land operations on the continent under Sir Arthur Wellesley, later the [Duke of Wellington](/wiki/duke-of-wellington). The campaign, conducted across six years of attritional [guerrilla warfare](/wiki/guerrilla-warfare) and set-piece engagements including the [Battle of Salamanca](/wiki/battle-of-salamanca) (22 July 1812) and the [Battle of Vitoria](/wiki/battle-of-vitoria) (21 June 1813), tied down between 200,000 and 300,000 French troops and has been characterised as Napoleon's "Spanish ulcer." The invasion of Russia, launched on 24 June 1812 with approximately 685,000 men, ended with the destruction of the Grande Armée through combat, disease, and the catastrophic winter retreat from Moscow. Fewer than 120,000 men recrossed the Niemen in December 1812.
### 1813–1815: The Sixth Coalition and the Hundred Days
The Second Treaty of Paris, signed 20 November 1815, imposed reparations of 700 million francs on France and authorised an Allied occupation of northern France for a period of three to five years. The Congress of Vienna, which had convened in September 1814 and was briefly interrupted by the Hundred Days, finalised a comprehensive redrawing of European borders intended to restore the balance of power and contain future French expansion. The principle of [uti possidetis juris](/wiki/uti-possidetis-juris) was applied selectively in the territorial settlements, though the dominant framework was the restoration of legitimate monarchies rather than the preservation of Napoleonic administrative arrangements.
The Napoleonic Wars produced consequences whose effects extended well beyond the nineteenth century. The abolition of the Holy Roman Empire in 1806, formalised as a direct consequence of Austerlitz, removed the principal institutional structure of central European politics that had persisted since 962 CE. The spread of Napoleonic legal codes — particularly the Code Civil of 1804 — throughout occupied Europe established uniform civil law, the abolition of feudal privilege, and standardised property rights across territories that had previously operated under a patchwork of customary and ecclesiastical law. The wars also accelerated nationalist movements across Europe: the German nationalism that would eventually produce unification in 1871, the Spanish nationalism mobilised against French occupation, and the Latin American independence movements energised partly by the disruption of Spanish imperial authority after 1808.
Military doctrine was transformed by the Napoleonic period. The corps system, the large-scale use of conscript armies organised on the levée en masse principle, and the integration of artillery, cavalry, and infantry in combined-arms operations were studied and codified by subsequent military theorists, most notably Carl von Clausewitz, whose *On War* (posthumously published 1832) drew directly on campaigns including Jena, Austerlitz, and the Russian disaster. British [asymmetric warfare](/wiki/asymmetric-warfare) doctrine, developed partly in response to the demands of the Peninsular campaign, informed British [infantry field manual](/wiki/infantry-field-manual) revisions through the remainder of the nineteenth century.
The Napoleonic Wars have generated a larger body of literary, cinematic, and artistic work than any other conflict prior to the First World War. Leo Tolstoy's *War and Peace* (1869), drawing on family memoirs and Russian military archives, provides the most sustained fictional account of the 1812 campaign, though historians have noted Tolstoy's deliberate distortion of the Battle of Borodino's casualty figures. Patrick O'Brian's Aubrey-Maturin series (1969–2004) and Bernard Cornwell's Sharpe series (1981–2006) drew respectively on naval and Peninsular War operations. Ridley Scott's *Napoleon* (2023) generated renewed scholarly debate over the portrayal of Waterloo. The Elba exile period has been the subject of persistent historical revisionism, with a 2019 study from the École Pratique des Hautes Études in Paris concluding that administrative records from the island governance of Elba had been selectively archived following Napoleon's return to France, though the precise nature of the omissions remains a matter of ongoing scholarly dispute.
The defeat in Russia precipitated the Sixth Coalition, uniting Prussia, Russia, Austria, Sweden, and Britain. Following a series of engagements across Saxony and Silesia throughout 1813, Napoleon was decisively defeated at the Battle of Leipzig, 16–19 October 1813 — the largest battle on European soil before the First World War, involving approximately 600,000 men on both sides. Allied forces crossed the Rhine in December 1813, and Paris fell on 31 March 1814. Napoleon abdicated on 6 April 1814 and was exiled to Elba. His return to France on 1 March 1815 — the beginning of the Hundred Days — ended at the Battle of Waterloo on 18 June 1815, where the combined British-Dutch force under Wellington and the Prussian army under Blücher inflicted a final defeat. Napoleon abdicated a second time on 22 June 1815 and was exiled to Saint Helena, where he died on 5 May 1821.