The Siege of Stralsund was a siege laid on Stralsund by Albrecht von Wallenstein's Imperial Army during the Thirty Years' War, from May to 4 August 1628. Stralsund was aided by Denmark and Sweden, with considerable Scottish participation. The siege ended Wallenstein's series of victories, and contributed to his downfall.[4] The Swedish garrison in Stralsund was the first on German soil in history.[5] The battle marked the de facto entrance of Sweden into the war.[3]