During this time, there was no big military operations in Europe. Even there was a British and French declaration of war on Germany and military alliances between the Western Allies and Poland. British Air Force dropped propaganda leaflets on Germany and Canadian troops began to arrive Britain. In the sea, German submarines destroyed many Allied ships, marked the beginning of Battle of the Atlantic.
In April 1940, Germany invaded Denmark and Norway. The two sides began to fight each other again. Britain and France needed a lot of weapons quickly, so they began to buy them from American weapon companies. American government helped Britain and France by selling weapons at lower cost, and, later, lend-lease of military equipments and supplies.