Complete the sentence about Halden with the correct year: The fortress had been erected in the 17th century as a replacement for the Bohus Fortress lost at the Treaty of Roskilde in ______ when Bohuslän was ceded to Sweden.

Answer and explanation

Correct answer: B. 1658

The fortress had been built in the 17th century to replace the Bohus Fortress lost in 1658.

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