At the onset of World War II, Norway declared its neutrality. Despite this, the country was attacked by Germany in April of 1940. After two months of military skirmishes, the Norwegians succumbed to occupation. In response, some citizens and most of the government leaders escaped. As many as 15,000 joined the Nazi military ranks while others chose to continue fighting in clandestine ways. The Norway’s Resistance Museum tells the stories of these underground forces from 1940 until the country was liberated in 1945. The Norges Hjemmefrontmuseum was established in 1966 on the grounds of the Akershus Fortress.