Battle of Jena
War of the Fourth Coalition · Jena, Thuringia (Kingdom of Prussia, present-day Germany)
Summary
On 14 October 1806 at Jena in Thuringia, Napoleon crushed the Prussian army of the Duke of Brunswick. Prussians, clinging to eighteenth-century tactics, were surprised by French speed and coordination. Brunswick was mortally wounded; about 25,000 Prussians were killed, wounded, or captured. The same day Davout won Auerstedt against the bulk of the Prussian army.
Historical context
Prussia declared war on France in August 1806, refusing Napoleonic demands after Austerlitz. Frederick William III and Brunswick concentrated the Prussian army at Jena, believing they held an impregnable position. Napoleon, on forced march, struck the Prussian wing before the entire army was concentrated.
Tactics
Napoleon concentrated his forces on the heights of Landgrafenberg, attacked the Prussian right wing, then broke the center with a massive frontal push. Cavalry and infantry in columns shattered the enemy line. Coordination between corps (Soult, Ney, Lannes, Augereau) was exemplary.
Consequences
Jena and Auerstedt destroyed the Prussian army in one day. Napoleon entered Berlin and imposed the humiliating Treaty of Tilsit (1807, after Friedland). Prussia lost half its territory and was forced into subordinate alliance. Jena symbolized superiority of Napoleon's corps system over Old Regime Prussian army.