World War II began when the Queen was just a teenager. Back then, her mother, also named Elizabeth, was known as the Queen consort and the Queen was Princess Elizabeth.
Though many urged the Queen consort to evacuate her children, Elizabeth and Margaret, to Canada, she refused. "The children won't go without me. I won't leave without the King. And the King will never leave," she said.
The family, like their country, endured hardship. Buckingham Palace was reportedly bombed nine times throughout the war. One of the worst bombings was in 1940 and happened while King George VI and his wife were in residence.
When Princess Elizabeth turned 18 in 1944, she insisted upon joining the Army, where she trained as a truck driver and mechanic. She remains the only female member of the royal family to have served in the Army.