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.

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.

In 1805, Gustav IV Adolf of Sweden entered the War of the Third Coalition on the anti-French side, primarily to strip Napoleon's ally Denmark of Norway.

[7] On 28 January,[8] French forces commanded by Marshal Mortier crossed the Peene River in an attempt to impose a blockade on Stralsund.

Without control of the island of Rügen, the French were unable to interrupt Stralsund's sea communications and were harassed by Swedish gunboats.

During the blockade, one French cavalry and three infantry regiments were taken from Mortier to fight against the Russians in Poland and replaced by troops from the Kingdom of Holland.

Grandjean fell back to Anklam where he was attacked again on 3 April and forced to retreat southeast to the fortress of Stettin on the Oder, arriving there on the 7th.

[8] Anxious to employ Mortier's men against the Russians and Prussians, Napoleon had authorized the marshal to make a truce with the Swedes.

They handed over the islands of Usedom and Wolin at the mouth of the Oder and promised not to help the Prussians at the sieges of Kolberg (Kolobrzeg) or Danzig.

[13] On 24 July, French Marshal Guillaume Brune attacked the Swedish positions on the Peene river[8] and reoccupied the investing lines around Stralsund.

[14] Brune's Spanish allies included General Pedro Caro, 3rd Marquis of la Romana's 14 infantry battalions and 12 cavalry squadrons.

[8] On 25 August, General of Brigade François Nicolas Fririon and naval Captain Peytes de Montcabrié attacked the fortified island of Dänholm near Rügen.

The 1,200-man and two-gun force comprised one battalion of the 30th Line Infantry Regiment, artillery, sappers, pontonniers, miners, and sailors of the Imperial Guard.