Meanwhile, the other main French force, which had fewer numbers in both men and weapons, was at Auerstädt, at which was a much larger Prussian force–in fact, this was the main part of the Prussian Army, under the overall command of the Duke of Brunswick and battlefield command of Friedrich Wilhlem Carl von Schmettau. Commanding the French forces was Marshal Louis Nicolas Davout. Prussia's King Frederick William III was with the main force, which numbered more than 60,000. Davout had 27,000 men in his force; the other French commander, Jean-Baptiste Bernadotte, had 20,000 men. Both commanders had been given orders to go to Jena because Bonaparte thought that he was facing the main Prussian army. They took different routes to get there, and Bernadotte succeeded in breaking free from the Prussian guard. That left Davout, who could not break out, along to face a Prussian force more than twice his size.

The French army, however, was experienced and well trained and, after several years of fighting under Bonaparte, used to doing things quickly, like fast marching and reacting to rapidly changing orders no matter the situation. In addition, the French chain of command was a rigid one and many of its troops were still fighting with the revolutionary zeal that had marked earlier wars against the monarchical powers of Europe. The Prussian army was none of these things, and that cost them in this battle quite heavily. An excess of commanders on the Prussian side led to confusion in battle and costly delays in the carrying out of orders, such that the fighting cost the lies of two Prussian commanders, the Duke of Brunswick and Schmettau. The initial success in French troops' defense against Prussian cavalry charges convinced the Prussian command to not only call off any further cavalry charges but also to order the infantry to fall back. It wasn't until well until the battle that the Duke of Brunswick had ordered a full-press attack, which might have been successful if employed at the start of the fighting. Davout, meanwhile, had a better sense for how the battle was progressing and, even though he was outnumbered, ordered a fierce counterattack that drove the Prussians from the field. Prussian casualties overall were 13,000; French losses numbered just more than half of that.

Bonaparte was overjoyed when he heard of the victory at Auerstädt as well. He was not amused when Bernadotte and his men arrived at Jena, having missed both battles.

Those battles occurred on October 14. Less than two weeks later, French armies captured Berlin. Relentless cavalry pursuit directed by Murat harried the Prussian retreat, ragged though it was. At Halle three days later, Bernadotte won a convincing army over another Prussian army, under the Duke of Württemberg. Just a few weeks later, the last Prussian defenses capitulated at Lubeck, and the Prussian king fled to Russia. He did not surrender.

French forces continued in their pursuit into Poland, capturing Warsaw and defeating the Russian Army on Feb. 8, 1807, at the Battle of Eylau, which was fought in a blinding snowstorm. In that nondecisive battle, casualties numbered in the tens of thousands. Both sides settled in for winter.

Yet another overwhelming French victory came on June 14, 1807, at Friedland, prompting Russia to surrender. In that battle, quick thinking by Lannes forced the Russian commander, Gen. Leonty Leontyevich Bennigsen, to mass his troops in one spot, making them easier to attack. Lannes had enticed the larger Russian force to concentrate on his much larger force, on the west bank of the Alle River, and, further, had held off the much larger force for most of the day until Bonaparte could assemble the rest of the Grand Armée for a counterattack. When the two large armies crashed into each other, 80,000 Frenchmen were fighting 58,000 Russians. The French made good on a push to drive the Russian troops into the town of Friedland and then trapped them there. French artillery proved superior yet again, scattering Russian troops and forcing many of them to try to escape by crossing the river; many drowned. Russia lost one-third of its force to death and injuries; French losses were 9,000.

The resulting Treaty of Tilsit, signed on July 7, took both Prussia and Russia out of the war, levied Prussia with a huge indemnity, and required both powers to give up territory. The borders of the Confederation of the Rhine widened, and French territory soon included the newly created Duchy of Warsaw.

While in the Prussian capital, Bonaparte had issued the Berlin Decree, on Nov. 21, 1806. This was the creation of the Continental System, a progenitor of the European Common Market that was designed to exclude the U.K. from European trade. The following month, Saxony allied with France and, therefore, left the Fourth Coalition. As a reward, Frederick Augustus I became ruler of the Duchy of Warsaw.

Sweden had been a largely supporting partner of the Alliance in both this war and the previous one. French troops defeated a Swedish force in August 1807, taking Sweden out of the fighting. That left only the U.K. fighting France, Russia having been, by the terms of the Treaty of Tilsit, not only bound to join the Continental System but also to declare war on the U.K. Thus ended the War of the Fourth Coalition.

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