* Poland: Germany invaded Poland on September 1, 1939, which is considered to be the start of World War II. The Polish army was quickly defeated, and Poland was divided between Germany and the Soviet Union.
* Denmark: Germany invaded Denmark on April 9, 1940, as part of its invasion of Scandinavia. Denmark surrendered without a fight.
* Norway: Germany invaded Norway on April 9, 1940, as part of its invasion of Scandinavia. Norway fought back, but was eventually defeated.
* Belgium: Germany invaded Belgium on May 10, 1940, as part of its invasion of Western Europe. The Belgian army fought back, but was eventually defeated.
* Luxembourg: Germany invaded Luxembourg on May 10, 1940, as part of its invasion of Western Europe. Luxembourg surrendered without a fight.
* Netherlands: Germany invaded the Netherlands on May 10, 1940, as part of its invasion of Western Europe. The Dutch army fought back, but was eventually defeated.
* France: Germany invaded France on May 10, 1940, as part of its invasion of Western Europe. The French army fought back, but was eventually defeated. France surrendered on June 22, 1940.