From 1933, the threat of Japanese invasion forced the evacuation of the most important parts of the Museum's collection. After the end of World War II, this collection was returned to Nanjing. However, with the Communists' victory imminent in the Chinese Civil War, the Nationalist government under Chiang Kai-shek ordered the evacuation of the pick of this collection to Taiwan. Of the 13,491 boxes of evacuated artifacts, 2,972 boxes are now housed in the National Palace Museum in Taipei. This relatively small but high quality collection today forms the core of that museum. More than 8,000 boxes were returned to Beijing, but 2,221 boxes remain today in storage under the charge of the Nanjing Museum.