When was the Battle of Jena-Auerstedt fought?
The twin battles of Jena and Auerstedt were fought on the 14th of October 1806 on the plateau west of the river Saale in Thuringia, Germany, at the outset of the War of the Fourth Coalition.
Short answers, pulled from the story.
The twin battles of Jena and Auerstedt were fought on the 14th of October 1806 on the plateau west of the river Saale in Thuringia, Germany, at the outset of the War of the Fourth Coalition.
Napoleon I commanded at Jena personally. At Auerstedt, the French were led by Marshal Louis-Nicolas Davout and his III Corps, which fought without support against the main Prussian force.
Davout quickly assessed the terrain, deployed his forces at Hassenhausen, and used a reverse-slope tactic to ambush Blucher's cavalry at a critical moment. When both Prussian commanders, the Duke of Brunswick and Schmettau, were struck down by 10 a.m., the Prussian command collapsed and Davout counter-attacked at 11 a.m., routing the larger force.
Bernadotte was within earshot of both battles but took no steps to aid either Davout or Napoleon. He argued he was following Napoleon's written orders to position his corps at Dornburg rather than march with Davout. Napoleon later stated on St. Helena that Bernadotte's behavior was disgraceful, though he sent only a reprimand and took no further action.
Napoleon made Davout Duke of Auerstedt in recognition of his victory. Napoleon also gave Davout the honor of leading his III Corps into Berlin first; Davout entered the Prussian capital on the 25th of October 1806.
The defeat exposed deep flaws in the Prussian military and state, spurring reforms led by officers who had served at the battle, including Scharnhorst, Gneisenau, Clausewitz, and Blucher. These reforms transformed Prussia into a modern state, which later led the expulsion of France from Germany and formed a central element of German nationalism.