Inactivity
While most of the German army was engaged in Poland, a much smaller German force manned the Siegfried Line, their fortified defensive line along the French border. At the Maginot Line on the other side of the border, British and French troops stood facing them, but there were only some local, minor skirmishes. The Royal Air Force dropped propaganda leaflets on Germany and the first Canadian troops stepped ashore in Britain, while western Europe was in a strange calm for seven months. Meanwhile, the opposing nations clashed in the Norwegian Campaign. In their hurry to re-arm, Britain and France had both begun buying large amounts of weapons from manufacturers in the U.S. at the outbreak of hostilities, supplementing their own productions. The non-belligerent U.S. contributed to the Western Allies by discounted sales, and, later, lend-lease of military equipment and supplies.
Despite the relative calm on land, on the high seas the war was very real indeed. Within a few hours of the declaration of war, the British liner SS Athenia was torpedoed off the Hebrides with the loss of 112 lives in what was to be the beginning of the long running Battle of the Atlantic. On 4 September, the Allies announced a blockade of Germany to prevent her importing food and raw materials to sustain her war effort, and the Germans immediately declared a counter-blockade.
At the Nuremberg Trials, Alfred Jodl said that "if we did not collapse already in the year 1939 that was due only to the fact that during the Polish campaign, the approximately 110 French and British divisions in the West were held completely inactive against the 23 German divisions."
Read more about this topic: Phoney War