Japan .... Japan’s conflict with China was growing. In 1931, Japanese army officers initiated the so-called Manchurian Incident by detonating a railway explosion and blaming it on Chinese bandits. They then used the event as an excuse to take over Manchuria in northeastern China and set up a puppet state there. Excursions into other areas of the country soon followed, and by 1937 war had broken out. That winter, the Japanese army massacred an estimated 200,000 civilians and prisoners of war in and around the city of Nanking.