Battle of Waterloo (1815)
The Battle of Waterloo (June 18, 1815) was Napoleon's final military defeat, ending the Hundred Days campaign and his imperial career, at the hands of Wellington's Anglo-allied army and Blücher's Prussian army in present-day Belgium, demonstrating both the military coalition that could only form because Napoleon had exhausted Europe's tolerance for French hegemony, and the narrow contingency of history: the French nearly won, and Napoleon's previous losses had been partly self-inflicted by political overreach, not military inability.
Waterloo was decided by timing: the Prussians arrived on Napoleon's right flank in the late afternoon, when his Imperial Guard assault on Wellington's line had been repulsed, converting a narrow defeat into a rout. The near-miss quality of the battle has generated centuries of counterfactual speculation (What if Grouchy had prevented the Prussian junction? What if Napoleon had attacked earlier?) that reflects the genuine contingency: Wellington himself said it was 'the nearest run thing you ever saw in your life.'
The broader strategic context: Napoleon returned from Elba in March 1815 to find France war-weary but willing to follow him against the Bourbon restoration. The Hundred Days, his final 100-day reign, demonstrated that his military genius had not degraded but that he now faced the full mobilization of European coalition power. At his peak (1805–1807), he had defeated the coalitions in detail; by 1815, the coalitions had learned to concentrate and coordinate against him before he could pick them apart.
Predictive History's Napoleon is the individual who genuinely changed the institutional landscape of Western civilization and then failed to consolidate the political settlement that would have made those changes permanent. Waterloo ended not just Napoleon's career but the possibility that France could lock in its Napoleonic institutional advantages across Europe. The Congress of Vienna (1815) that followed was the conservative reaction's attempt to restore the old order, partially successful in the short term, ultimately futile against the liberal and nationalist forces Napoleon's campaigns had unleashed. Wellington won at Waterloo; Napoleon won the 19th century.
Related articles
Frequently asked questions
Why did Napoleon lose the Battle of Waterloo? ＋
Prussian arrival on his flank late in the day converted a repulsed Imperial Guard assault into a rout, timing and coalition coordination, not military incompetence. Wellington called it 'the nearest run thing you ever saw.' The broader reason: by 1815 the European coalitions had learned to concentrate before Napoleon could defeat them in detail. He had changed Europe's institutions permanently through the Napoleonic Code and the levée en masse, Predictive History's verdict: Wellington won Waterloo; Napoleon won the 19th century.