What are all the obstacles the Balicki children had to face in The Silver Sword book?

• The children are forced to live alone in Warsaw after their mother is taken away and their father is arrested.

• The children escape after being placed in a refugee camp, and they are left alone to begin their search for their parents.

• The children face hunger, cold, and danger as they make their way across Europe.

• Separation from family, and the loss of the silver sword.