. "Swedish invasion 1658"@en . . . "Swedish invasion 1814"@en . . "17"^^ . . . "Fredriksten is a fortress in the city of Halden in Norway."@en . "17"^^ . . "Fredriksten is a fortress in the city of Halden in Norway."@en . . . "Halden, Norway"@en . "Fredriksten festning"@en . . "Norway"@en . "Fredriksten fortress, Halden, Norway - seen from the city's harbor"@en . "Swedish invasion 1660"@en . . . "Swedish invasion 1716"@en . "Fredriksten"@en . "Swedish invasion 1659"@en .