Western Front (World War II)  The Western Front was a military theatre of World War II encompassing Denmark, Norway, Luxembourg, Belgium, the Netherlands, the United Kingdom, France, Italy, and Germany. World War II military engagements in Southern Europe and elsewhere are generally considered as separate theatres. The Western Front was marked by two phases of large-scale combat operations. The first phase saw the capitulation of the Netherlands, Belgium, and France during May and June 1940 after their defeat in the Low Countries and the northern half of France, and continued into an air war between Germany and Britain that climaxed with the Battle of Britain. The second phase consisted of large-scale ground combat (supported by a massive air war considered to be an additional front), which began in June 1944 with the Allied landings in Normandy and continued until the defeat of Germany in May 1945. The Phoney War was an early phase of World War II marked by a few military operations in Continental Europe in the months following the German invasion of Poland and preceding the Battle of France. Although the great powers of Europe had declared war on one another, neither side had yet committed to launching a significant attack, and there was relatively little fighting on the ground. This was also the period in which the United Kingdom and France did not supply significant aid to Poland, despite their pledged alliance. While most of the German Army was fighting against 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, French troops stood facing them, whilst the British Expeditionary Force and other elements of the French Army created a defensive line along the Belgian border. There were only some local, minor skirmishes. The British 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. In their hurry to re-arm, Britain and France had both begun to buy large numbers of weapons from manufacturers in the United States at the outbreak of hostilities, supplementing their own production. The non-belligerent United States contributed to the Western Allies by discounted sales of military equipment and supplies. German efforts to interdict the Allies' trans-Atlantic trade at sea ignited the Battle of the Atlantic. While the Western Front remained quiet in April 1940, the fighting between the Allies and the Germans began in earnest with the Norwegian Campaign when the Germans launched Operation Weserübung, the German invasion of Denmark and Norway.