Battle near Jena, 14 October 1806, (c1850). The battle of Jena in Germany began with the chance evening meeting of Marshal Lannes' corps with a Prussian force of 35,000 men under General Friedrich Hohenloe. At 1pm, Napoleon ordered a general advance and within two hours the exhausted Prussians gave way, fleeing the field and trying to avoid the sabres of Marshal Murat's horsemen. Jena cost Bonaparte some 5000 men, but the Prussians had a staggering 25,000 casualties. Print from a series depicting the campaigns of Napoleon I, published c1850.