The attack on Marstrand was a successful Dano-Norwegian siege of the Swedish town of Marstrand and Carlsten fortress which took place between July 10 and July 16, 1719 during the end of the Great Northern War.
After a Dano-Norwegian assault on northern Bohuslän, ships under the command of Peter Tordenskjold attacked the Swedes at Marstrand harbor and the immobile ships of the Swedish Gothenburg Fleet. The Danes subsequently attacked Carlsten fortress, whose garrison surrendered swiftly, partly because of psychological warfare.
The commander of the fortress, Colonel Henrich Danckwardt, was later sentenced to death by a Swedish court-martial for abandoning the fort while it was still deemed defensible.
The surrender of Carlsten fortress in 1719 is still surrounded by myths and legends.
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