Fredrikstad fortress was constructed in the city of Fredrikstad 1663-1666 by the officer W. Coucheron after order of the Danish-Norwegian King Frederick. The first commander was appointed 6 January 1662, he was LtCol Johan Eberhard Speckhan. Besides the fortress the prison works was also under the supervision of the commander of Fredrikstad fortress. In 1716 the fortress was used by the naval hero Tordenskjold when he attacked the Swedish fleet at Dynekil. The only time the fortress were attacked was when Sweden invaded Norway in 1814, and the fortress capitulated 4 august 1814. County Østfold Landscape Municipality NO-0106 Administrative centre Fredrikstad Mayor (2003) Ole Haabeth (Ap) Official language form BokmÃ¥l Area  - Total  - Land  - Percentage Ranked 283 288 km² 283 km² 0. ... Frederick III (March 28, 1609 – February 19, 1670) was King of Denmark and Norway from 1648 until his death. ... Peter Wessel Tordenskjold 1691-1720 Peter Wessel Tordenskjold, also known as Peter Wessel, Peder Tordenskjold, or Peder Tordenskiold, (October 28, 1691-1720), was an eminent Norwegian naval hero in the service of the Kingdom of Denmark-Norway. ...

The fortress was closed in 1903, but continued to serve as a garrison. Fredrikstad fortress is unique in Norway by being the only fortress that is preserved as it was. The remaining military installations was closed in 2001 and today the fortress is very popular for visitors; with its mix of old buildings and art exhibitions.