Denmark-Norway built Fredriksten Fortress in Halden to replace Bohus, which was lost to Sweden under the Treaty of Roskilde in 1658. It is named after King Fredrik III. Tønne Huitfeldt began the fortifications in 1659, and Ernst von Tettau led an expansion from 1684 to 1689. The article names no architect.
It is a star-shaped complex. The citadel is surrounded by three outer works: Gyldenløve, Overberget and Stortårnet. Work was expanded from 1682 to 1701. The article gives no materials or dimensions.
Charles XII's assault failed in July 1716, and he was killed while inspecting the siege works on December 11, 1718. In 1814 the fortress was bombarded but not captured. It now hosts museums, art exhibitions and summer concerts.
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