Napoleon's planned invasion of the United Kingdom in the context of "Boulogne-sur-Mer"

The War of the Third Coalition (French: Guerre de la Troisième Coalition) was a European conflict lasting from 1805 to 1806 and was the first conflict of the Napoleonic Wars. During the war, France and its client states under Napoleon I and its ally Spain opposed an alliance, the Third Coalition, which was made up of the United Kingdom, the Austrian Empire, the Russian Empire, Naples, Sicily, and Sweden. Prussia remained neutral during the war.

Britain had already been at war with France following the breakdown of the Peace of Amiens and remained the only country still at war with France after the Treaty of Pressburg. From 1803 to 1805, Britain was under constant threat of a French invasion. The Royal Navy, however, assured its naval dominance at the Battle of Trafalgar in October 1805.

The Battle of Trafalgar was a naval engagement that took place on 21 October 1805 between the Royal Navy and a combined fleet of the French and Spanish navies during the War of the Third Coalition. As part of Napoleon's planned invasion of the United Kingdom, the French and Spanish fleets combined to take control of the English Channel and provide the Grande Armée safe passage. The allied fleet, under the command of French admiral Pierre-Charles Villeneuve, sailed from the port of Cádiz in the south of Spain on 18 October 1805. They encountered a British fleet under Lord Nelson, recently assembled to meet this threat, in the Atlantic Ocean along the southwest coast of Spain, off Cape Trafalgar.

Nelson was outnumbered, with 27 British ships of the line to 33 French and Spanish, including the largest warship in either fleet, the Spanish Santísima Trinidad. To address this imbalance, Nelson sailed his fleet directly at the allied battle line's flank in two columns, hoping to break the line into pieces. Villeneuve had worried that Nelson might attempt this tactic, but for various reasons, failed to prepare for it. To add to the French crisis, their crews were inexperienced and poorly trained. The British plan worked almost perfectly; Nelson's columns split the Franco-Spanish fleet in three, isolating the rear half from Villeneuve's flag aboard Bucentaure. The allied vanguard sailed off while it attempted to turn around, giving the British temporary superiority over the remainder of their fleet. In the ensuing fierce battle 18 allied ships were captured or destroyed, while the British lost none.

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.

The Grande Armée (pronounced [ɡʁɑ̃d aʁme]; French for 'Great 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.

The Batavian Navy (Dutch: Bataafsche marine) was the navy of the Batavian Republic which existed from 1795 to 1806. Founded in May 1795 after the Dutch Republic was overrun by France during the French Revolutionary Wars and transformed into the Batavian Republic, it assumed control over the ships and administrative infrastructure of the Dutch States Navy. The Batavian navy underwent a thorough reorganisation and embarked on several construction programmes in an attempt to match the strength of its main rival, the Royal Navy. Despite this, the British navy inflicted several crushing defeats on the Batavian Navy at the capitulation of Saldanha Bay, Battle of Camperdown and Vlieter incident.

The British also occupied much of the Dutch colonial empire during the French Revolutionary Wars, which the Batavian Navy was powerless to prevent. Despite losing much of its fleet by 1802, the Batavian navy's reorganisations proved to be durable, and it played a role in Napoleon's planned invasion of the United Kingdom and efforts to restore Batavian rule in the Dutch colonies returned by Britain under the Treaty of Amiens. However, the Batavian Navy was again unable to prevent Britain from occupying its colonies after the Napoleonic Wars began in 1803. The Batavian Republic became the Kingdom of Holland in June 1806, with the Batavian navy being transformed into the navy of the Kingdom of Holland.