The German invasion of Norway, Operation Weserübung or ‘Weser’ was planned and led by General Falkenhurst. In February Hitler gave him a matter of hours to devise his initial plan in secret. Falkenhurst consulted a Baedeker tourist guidebook in his hotel room to develop his overall strategy, and his proposals were accepted by Hitler later that same day.
The German plan called for five different task groups to land simultaneously at different ports along the coast on the morning of the 9th April. The Admiral Hipper was part of Group 2 destined for Trondheim, she would be in action with the Royal Navy before she got there.