The Siege of Stralsund, 13 May to 4 August 1628, took place during the Thirty Years' War when an Imperial Army under Albrecht von Wallenstein attempted to capture the key Baltic Sea port of Stralsund. Then an independent city and part of the Hanseatic League, Stralsund was initially reinforced by small numbers of Scots mercenaries in Danish service, before Gustavus Adolphus of Sweden sent a larger force under Alexander Leslie.
The failure of the siege ended Wallenstein's series of victories, while Straslund was held by the Swedes for most of the next two hundred years. It provided Gustavus a bridgehead within the Holy Roman Empire that in 1630 facilitated Swedish intervention in the Thirty Years' War.
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