When World War II broke out, Elizabeth 13 years old. She and her sister Princess Margaret took refuge in Barmore. At that time, it was suggested that the two princesses take refuge in Canada, but their mothers objected: "The children can't leave me, I can't leave the king, and the king can't leave under any circumstances." 1940, Princess Elizabeth made her first broadcast, which was aimed at all the children who were taken in.

1945 princess Elizabeth persuaded her father to allow her to participate directly in helping win the war. She joined a women's organization that supports the war. Her number is 230873, Lieutenant elizabeth windsor. This is the first time she has been trained with other children. It is said that she liked this experience very much, and it was because of this experience that she later sent her children to school instead of letting them study at home.