Phony War
Who: British, French, and Germans
What: Also called Sitzkrieg. The British and French waited 8 months for the expected attack in the west from Germany which did not come. In April, Germany went north instead and took Denmark and Norway which were both neutral.
Where: Continental Europe
When: September 1939 - April 1940
Significance: France and Britain declared war on Germany after Germany invaded Poland. However, their entry into the war did not help Poland. Instead, they waited for Germany to attack creating the phony war.