After a busy day of playing pranks on the guests and servants of their father, Harry Williams, Jane and Katherine Williams tumble into bed and fall asleep. Having seen a movie depicting World War I fighting in Europe, little Jane dreams that two armies, consisting entirely of mechanical dolls, are advancing against each other in battle. While Trik leads the German troops, who are guilty of committing a score of atrocities, Trak heads the Allied army, which ultimately wins the war. In the end, Jane awakens with a start to find that it has all been a dream.