During World War II, Olav stood by his father's side in resisting the German occupation of Norway. During the campaign he was a valuable advisor both to civilian and military leaders. When the Norwegian government decided to go into exile, he offered to stay behind with the Norwegian people, but this was declined. He reluctantly followed his father to the United Kingdom, where he and his staff and servants and aides continued to be a key advisor to the government-in-exile and his father. It is a popular legend among his countrymen that he did not allow himself any dessert or sweets for the duration of the Norwegian occupation.