After the Phoney War of October 1939 to April 1940 , Germany invaded Attack Belgium , the Netherlands , and France on 10 May 1940 .

The Phoney War ( ; ) was an eight-month period at the start of World War II , during which there was only one limited military land operation Military_operation on the Western Front , when French troops invaded Attack Germany 's Saar district .

The Phoney period began Process_start with the declaration of war by the United Kingdom and France against Nazi Germany on 3 September 1939 , and ended Process_end with the German invasion Attack of France and the Low Countries on 10 May 1940 .

The quiet of the Phoney War was punctuated Destroying by a few Allied actions .

The campaign Hostile_encounter started Process_start immediately after the European War Hostile_encounter began Process_start , during the so-called `` Phoney War Hostile_encounter '' , and lasted six years , until the German Surrender Surrendering in May 1945 .