Answer:
Poland (attacked in September 1939)
Explanation:
Germany successfully used the Blitzkrieg tactic against
Poland (attacked in September 1939)
Denmark (April 1940)
Norway (April 1940)
Belgium (May 1940)
the Netherlands (May 1940)
Luxembourg (May 1940)
France (May 1940)
Yugoslavia (April 1941)
Greece (April 1941
Author(s): United States Holocaust Memorial Museum, Washington, DC
