December 13, 1937 is a day etched in the collective Chinese consciousness. On that day, the Japanese imperial army marched into the city of Nanjing—then the capital of China—and unleashed a wave of violence for six long weeks. The soldiers attacked ordinary citizens and violated all acceptable international norms of war. This act of mass violence marked the beginning of World War II in Asia. It is difficult to mark the anniversary of this dark chapter today without reflecting on contemporary global events reminding us all of the fragility of peace and democracy.