The New Student's Reference Work/Jena, Battle of

Jena (yā́′nȧ), Battle of. This name is applied to two engagements fought on the same day, Oct. 14, 1806 — one at Auerstadt, 14 miles north, between 30,000 French under Davoust and 48,000 Prussians under the duke of Brunswick; the other on the heights around Jena between 70,000 Prussians under the prince of Hohenlohe and 90,000 French under Napoleon. In both the Prussians were badly defeated, leaving the fatherland at the mercy of Napoleon.