War of the Fourth Coalition in the context of "Prussian Army"

The Napoleonic Wars (1803–1815) were a global series of conflicts fought by a fluctuating array of European coalitions against the French First Republic (1803–1804) under the First Consul followed by the First French Empire (1804–1815) under the Emperor of the French, Napoleon Bonaparte. The wars originated in political forces arising from the French Revolution (1789–1799) and from the French Revolutionary Wars (1792–1802) and produced a period of French domination over Continental Europe. The wars are categorised as seven conflicts, five named after the coalitions that fought Napoleon, plus two named for their respective theatres: the War of the Third Coalition, War of the Fourth Coalition, War of the Fifth Coalition, War of the Sixth Coalition, War of the Seventh Coalition, the Peninsular War, and the French invasion of Russia.

The first stage of the war broke out when Britain declared war on France on 18 May 1803. After some minor campaigns, Britain allied with Austria, Russia, and several minor powers to form the Third Coalition in April 1805. Napoleon defeated the allied Russo-Austrian armies in the subsequent war which climaxed in French victories at Ulm and at Austerlitz, leading to the dissolution of the Holy Roman Empire and Austria being forced to make peace by the end of the year. Britain and Russia remained at war with France. Concerned about increasing French power, Prussia joined Britain and Russia in the Fourth Coalition, which resumed war in October 1806. Napoleon defeated the Prussians at Jena-Auerstedt and the Russians at Friedland, bringing an uneasy peace to the continent by July 1807, and again leaving Britain as France's sole major enemy. Britain was unable to dispute French dominance on the continent but obtained hegemony over the seas after a string of victories including Trafalgar. Russia used the interim peace to resolve wars with the Ottomans, Swedes, and Iranians.

In the War of the Sixth Coalition (French: Guerre de la Sixième Coalition; December 1812 – May 1814), sometimes known in Germany as the Wars of Liberation (German: Befreiungskriege), a coalition of Austria, Prussia, Russia, Spain, the United Kingdom, Portugal, Sweden, Sardinia, and a number of German States defeated France and drove Napoleon into exile on Elba. After the disastrous French invasion of Russia of 1812 in which they had been forced to support France, Prussia and Austria joined Russia, the United Kingdom, Sweden, and Portugal, and the rebels in Spain who were already at war with France. The invasion of Russia cost the French many seasoned soldiers, so Napoleon took action to engage "Marie-Louises", young conscripts who were barely familiar with military affairs; they were called up from October 1813 to 1815. However, the constant warfare weakened the Coalition nations as well. The Russian military was particularly depleted after 1812, and Prussia also suffered a significant downgrade as a result of its losses in 1806–1807; nevertheless, it carried out large-scale reforms to improve the situation in the Prussian Army. Later, having encountered the Prussians in the Battle of Lützen, Napoleon would say: "These animals have learned something."

The War of the Sixth Coalition saw battles at Lützen, Bautzen, and Dresden. The even larger Battle of Leipzig (also known as the Battle of Nations) was the largest battle in European history before World War I. Ultimately, Napoleon's earlier setbacks in Spain, Portugal and Russia proved to be the seeds of his undoing. With their armies reorganized, the allies drove Napoleon out of Germany in 1813 and invaded France in 1814. The Allies defeated the remaining French armies, occupied Paris, and forced Napoleon to abdicate and go into exile. The French monarchy was revived by the allies, who handed rule to the heir of the House of Bourbon in the Bourbon Restoration.

The French Revolutionary and Napoleonic Wars (sometimes called the Great French War or the Wars of the Revolution and the Empire) were a series of conflicts between the French and several European monarchies between 1792 and 1815. They encompass first the French Revolutionary Wars against the newly declared French Republic and from 1803 onwards, the Napoleonic Wars against First Consul and later Emperor Napoleon Bonaparte. They include the Coalition Wars as a subset: seven wars waged by various military alliances of great European powers, known as Coalitions, against Revolutionary France – later the First French Empire – and its allies between 1792 and 1815:

• War of the First Coalition (April 1792 – October 1797)
• War of the Second Coalition (November 1798 – March 1802)
• War of the Third Coalition (April 1805 – July 1806)
• War of the Fourth Coalition (October 1806 – July 1807)
• War of the Fifth Coalition (April – October 1809)
• War of the Sixth Coalition (March 1813 – May 1814)
• War of the Seventh Coalition, also known as the Hundred Days (March – July 1815)

Although the Coalition Wars are the most prominent subset of conflicts of this era, some French Revolutionary Wars such as the French invasion of Switzerland, and some Napoleonic Wars such as the French invasion of Russia and the Peninsular War, are not counted amongst the "Coalition Wars" proper.

The Ulm campaign was a series of French and Bavarian military maneuvers and battles to outflank and capture an Austrian army in 1805 during the War of the Third Coalition. It took place in the vicinity of and inside the Swabian city of Ulm. The French Grande Armée, led by Emperor Napoleon, had 210,000 troops organized into seven corps and hoped to knock out the Austrian army in the Danube before Russian reinforcements could arrive. Rapid marching let Napoleon conduct a large wheeling maneuver, which captured an Austrian army of 60,000 under Feldmarschall-Leutnant (FML) Karl Freiherr Mack von Leiberich on 20 October at Ulm. The campaign is by some military historians regarded as a strategic masterpiece and was influential in the development of the Schlieffen Plan in the late 19th century. Napoleon himself wrote:

The victory at Ulm did not end the war since a large Russian army under Mikhail Kutuzov was near Vienna to defend the city against the French. The Russians withdrew to the northeast to await reinforcements and to link up with Austrian army units. The French moved aggressively forward and captured Vienna on 12 November. On 2 December, the massive Battle of Austerlitz, causing 24,000 to 36,000 casualties, removed Austria from the war. The resulting Treaty of Pressburg in late December brought the Third Coalition to an end and established Napoleonic France as the major power in Central Europe, which led to the War of the Fourth Coalition against the Kingdom of Prussia and Russia the following year.

The Battle of Austerlitz (2 December 1805/11 Frimaire An XIV FRC), also known as the Battle of the Three Emperors, was one of the most important military engagements of the Napoleonic Wars. The battle occurred near the town of Austerlitz in the Austrian Empire (now Slavkov u Brna in the Czech Republic). Around 158,000 troops were involved, of which around 24,000 were killed or wounded.

The battle is often cited by military historians as one of Napoleon's tactical masterpieces, in the same league as other historic engagements like Hannibal's Cannae (216 BC) or Alexander the Great's Gaugamela (331 BC). The military victory of Napoleon's Grande Armée at Austerlitz brought the War of the Third Coalition to an end, with the Peace of Pressburg signed by the French and Austrians later in the month. These achievements did not establish a lasting peace on the continent. Austerlitz had driven neither Russia nor Britain, whose armies protected Sicily from a French invasion, to settle. Prussian resistance to France's growing military power in Central Europe led to the War of the Fourth Coalition in 1806.

The twin battles of Jena and Auerstedt (German pronunciation: [ˈjeːna … ˈaʊ̯ɐ.ʃtɛt]; older spelling: Auerstädt) were fought on 14 October 1806 on the plateau west of the river Saale in today's Germany, more specifically in today's Thuringia, between the forces of Napoleon I of France and Frederick William III of Prussia, at the outset of the War of the Fourth Coalition during the Napoleonic Wars. The disastrous defeats suffered in these battles by the Prussian Army, which had not been reformed for about half a century, subjugated the Kingdom of Prussia to the French Empire until the Sixth Coalition was formed in 1813.

The Prussians did not forget the military glory of Frederick the Great and venerated it, but by the time of the war, changes were needed for victory, despite the fact that Prussia showed itself well in the French Revolutionary Wars. Thus at Jena and Auerstedt the backwardness of the Prussian Army became apparent. By 1806, Prussian military doctrines have been unchanged for more than 50 years,—tactics were monotonous, and wagon system was obsolete. The Prussian musket of 1806 (the 1754 model) was called "the worst in Europe" by one authority; there were many recruited non-Prussians in the royal army. At the same time, Napoleon's army was recently reorganized according to the advanced corps system, which the French Emperor improved greatly by 1805. At Jena the French were led by Napoleon himself, and at Auerstedt they were led by one of the most outstanding commanders of the Napoleonic Wars, Louis-Nicolas Davout. The battle took the Prussian supreme commander at Jena, Prince of Hohenlohe-Ingelfingen, by surprise due to his misorientation and ignorance of the enemy. Due to this incompetence, the Prussians fought a series of isolated, disjointed engagements, unconnected by a unified plan. From beginning to end, Hohenlohe remained disoriented regarding the enemy's strength and direction of advance, and not only did not find time to maintain control of the battle but was unable to even organize an adequate retreat; whilst Napoleon showed firm will at Jena, skillfully taking advantage of both the weather conditions (fog) and the rugged terrain when his troops gradually entered the battle from the march.

The Treaties of Tilsit (French: Traités de Tilsit), also collectively known as the Peace of Tilsit (German: Friede von Tilsit; Russian: Тильзитский мир, romanized: Tilzitski mir), were two peace treaties signed by French Emperor Napoleon in the town of Tilsit in July 1807 in the aftermath of his victory at Friedland, at the end of the War of the Fourth Coalition. The first was signed on 7 July, between Napoleon and Russian Emperor Alexander I, when they met on a raft in the middle of the Neman river. The second was signed with Prussia on 9 July. The treaties were made at the expense of King Frederick William III of Prussia, who had already agreed to a truce on 25 June after the Grande Armée had captured Berlin and pursued him to the easternmost frontier of his realm.

In Tilsit, Prussia ceded about half of its pre-war territories. From these territories, Napoleon had created French client states, which were formalized and recognized at Tilsit: the Kingdom of Westphalia, the Duchy of Warsaw and the Free City of Danzig; the other ceded territories were awarded to existing French client states and to Russia.

The Grande Armée (pronounced [ɡʁɑ̃d aʁme]; French for 'Grand Army') was the primary field army of the French Imperial Army during the Napoleonic Wars. Commanded by Napoleon, from 1804 to 1808 it won a series of military victories that allowed the First French Empire to exercise unprecedented control over most of Europe. Widely acknowledged to be one of the greatest fighting forces ever assembled, it suffered catastrophic losses during the disastrous French invasion of Russia, after which it never recovered its strategic superiority and ended its military career with a total defeat during the Hundred Days in 1815.

The Grande Armée was formed in 1804 from the Armée des côtes de l'Océan (Army of the Ocean Coasts) more commonly referred to as the Armée d'Angleterre (Army of England), a field army of over 100,000 men assembled for Napoleon's planned invasion of the United Kingdom. He subsequently led the field army to Central Europe and defeated Austrian and Russian forces as part of the War of the Third Coalition. Thereafter, the Grande Armée was the principal field army deployed in the War of the Fourth Coalition, Peninsular War and War of the Fifth Coalition, where the French army slowly lost a large portion of its veteran soldiers, strength and prestige, and in the invasion of Russia, War of the Sixth Coalition and Hundred Days. The term Grande Armée is often used to refer to multinational armies led by Napoleon in his campaigns; however, during the War of the Fifth Coalition and the Waterloo campaign (part of the Hundred Days), other formations were led by him de facto, namely the Army of Germany and the Army of the North, respectively.