The siege of Stralsund lasted from 24 July to 24 August, 1807, and saw troops from the First French Empire twice attempt to capture the port city from Lieutenant General Hans Henric von Essen's 15,000-man Swedish garrison. Early that year, Marshal Édouard Adolphe Casimir Joseph Mortier blockaded the city for two months before he was called elsewhere. In his absence, the Swedes drove back the inferior blockading force. After Mortier returned and pushed Essen's troops back in turn, the two sides quickly concluded an armistice. The truce was later repudiated by King Gustav IV Adolf of Sweden, and Marshal Guillaume Marie Anne Brune then led 40,000 French, German, Spanish, Italian and Dutch soldiers against the fortress. Fearfully outnumbered, the Swedes abandoned the Baltic Sea port of Stralsund to the Franco-Allies in the action during the War of the Fourth Coalition, part of the Napoleonic Wars. As a consequence, Sweden also lost the nearby island of Rügen.

Édouard Adolphe Casimir Joseph Mortier, Duke of Treviso, was a French military commander and Marshal of the Empire under Napoleon I, who served during the French Revolutionary Wars and the Napoleonic Wars. He served as Minister of War and Prime Minister of France from 1834 to 1835. He was one of 18 people killed in 1835 during Giuseppe Marco Fieschi's assassination attempt on King Louis Philippe I.