Carlsten (Swedish: Karlstens fästning) is a stone fortress located at Marstrand, on the western coast of Sweden. The fortress was built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s. After peace in Roskilde in 1658, Bohuslän and thus Marstrand became Swedish. The city has long been a major trading place. Since the harbor almost never freezes, part of the Swedish Navy was stationed here. To defend Marstrand, Karl X Gustav decided to build a fortress on the island. On July 23, 1677, after an attack on the fortifications in Marstrand, Carlsten was conquered by Ulrik Frederik Gyldenløve, the Danish military commander in Norway. In 1719, the fortress was attacked and besieged for a second time in its history by the Norwegian Vice-Admiral Tordenskjold, falling into enemy hands. The fortress was returned to Swedish control through negotiations and treaties. More information...
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