For educational purposes

It's one of the most daring and bold operations of WW2: The Nazi's occupation and fortification of Norway.

Hitler demands breath-taking defences along the country's 1500 mile coastline to prevent an Allied invasion. It includes some of the biggest gun batteries of the entire war.

Norway is an Arctic frontline from which the Nazis can attack the Soviet Union, but it also offers Hitler the possible means to make an atomic bomb.