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Napoleon's Grande Armee crossed the Niemen into Russia

On this day · 24 June 1812
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On June 24, 1812, Napoleon led roughly half a million men across one river and into the campaign that would unmake his empire.

Verified · Brown University Library – Napoleon: Timeline of the Russian Campaign

Before dawn on June 24, 1812, the first columns of Napoleon’s Grande Armee crossed the Niemen River near Kovno (modern Kaunas, Lithuania) on bridges thrown up overnight. It was the largest army Europe had yet assembled—around 500,000 men at the border, with more to follow—and Napoleon watched the crossing from a rise above the water.

The goal was to force Tsar Alexander I back into line behind France’s blockade of British trade. Instead, the Russians refused a decisive battle, retreating eastward and burning the country behind them. The Grande Armee reached a half-deserted Moscow in September, then began a catastrophic winter retreat.

Of the vast host that crossed the Niemen in June, fewer than 100,000 would stagger back out.

Disease, starvation, and cold did far more damage than Russian guns. The campaign shattered the myth of Napoleon’s invincibility and emboldened the coalition that would defeat him within two years.

500K
troops at the border
<100K
made it back
1812
the campaign year

Sources & references

2 references

Well-established. Corroborated by 2 independent sources.

1 Brown University Library – Napoleon: Timeline of the Russian Campaign academic library “In May 1812 Napoleon took command of the multinational Grande Armee assembled in Poland and on 24-25 June crossed the Niemen into Russian territory.” library.brown.edu ↗
2 HISTORY media “On 24 June, Napoleon at the head of his army crossed the Prussian-Russian border near Kovno (Kaunas, modern-day Lithuania), at the river Niemen ... some 500,000 soldiers and staff.” history.com ↗
✓ Last reviewed Jun 7, 2026

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