Siege of Tönning
1714 CE.
Shown on the map at 54.317°, 8.950°.
During the Great Northern War, the fortress of Tönning (Danish: Tønning) in the territory of Holstein-Gottorp, an ally of the Swedish Empire, was besieged twice. Denmark–Norway was forced to lift the first siege in 1700, but a combined force of the anti-Swedish coalition successfully besieged and took Tönning in 1713–1714.
Text from the Wikipedia article Siege of Tönning, licensed CC BY-SA 4.0.