Napoleonic Wars: A British frigate squadron defeated a much larger squadron of French and Italian frigates and smaller vessels in the Battle of Lissa in the Adriatic Sea.

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.

A frigate is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied.

The Battle of Lissa, also known as the Battle of Vis, was a naval action fought between a British frigate squadron and a much larger squadron of French and Italian frigates and smaller vessels on Wednesday, 13 March on 1811 during the Adriatic campaign of the Napoleonic Wars. The engagement was fought in the Adriatic Sea for possession of the strategically important Croatian island of Vis, from which the British squadron had been disrupting French shipping in the Adriatic. The French needed to control the Adriatic to supply a growing army in the Illyrian Provinces, and consequently dispatched an invasion force in March 1811 consisting of six frigates, numerous smaller craft and a battalion of Italian soldiers.

The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto to the northwest and the Po Valley. The countries with coasts on the Adriatic are Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia.