Rustkammeret is an army museum as well as a resistance museum, emphasizing Trøndelag's military history. Norway's finest collection of edged weapons is on display at the museum. The museum shows military history from Viking times, through the Middle Ages and the union with Denmark and later Sweden. The resistance section of the museum takes us back into Norway's recent history, from the start of the German occupation on 9 April 1940 until peace was restored on 8 May 1945.