During the retreat , the Danish - Norwegian army lost 1,500 - 3,000 men to hunger , disease , poor sanitary conditions , and exposure to continual autumn rainfall .
On 12 November , the Norwegian army retreated back to Norway .
During the retreat , the Norwegian     army lost 1,500 - 3,000 men to hunger , disease , poor sanitary conditions , and exposure to continual autumn rainfall .
On 12 November , the Norwegian army retreated back to Norway .