During the Great Northern War, the fortress of Tönning 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.
The first siege was one of the first military actions of the Great Northern War. Denmark-Norway, Saxe-Poland-Lithuania and Russia had agreed on invading the Swedish Empire on three fronts, and accordingly, Danish forces moved into Holstein-Gottorp, allied and dynastically tied to Sweden, and laid siege to Tönning in March 1700. The siege had to be lifted when Charles XII of Sweden, backed by the Maritime Powers, in a surprise move deployed an army in front of Copenhagen, forcing Frederik IV of Denmark-Norway out of the war by the Peace of Travendal on 18 August 1700. Denmark re-entered the war only in 1709 as a consequence of the Swedish defeat at Poltava.
Copyright: CC 3.0