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, and Germany. The Italian front is considered a separate but related theatre. The Western Front's 1944–1945 phase was officially deemed the European Theater by the United States, whereas Italy fell under the Mediterranean Theater along with the North African campaign. The Western Front was marked by two phases of large-scale combat operations. The first phase saw the capitulation of Luxembourg, 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 strategic 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 with its invasion.

On 1 September 1939, World War II began with the German invasion of Poland. In response, Britain and France declared war on Germany on 3 September. The next few months in the war were marked by the Phoney War.

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.

The French forces launched a small offensive, the Saar Offensive against Germany in the Saar region but halted their advance and returned. 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. In doing so, the Germans beat the Allies to the punch; the Allies had been planning an amphibious landing in which they could begin to surround Germany, cutting off her supply of raw materials from Sweden. However, when the Allies made a counter-landing in Norway following the German invasion, the Germans repulsed them and defeated the Norwegian armed forces, driving the latter into exile. The Kriegsmarine, nonetheless, suffered very heavy losses during the two months of fighting required to seize all of mainland Norway.

In May 1940, the Germans launched the Battle of France. The Western Allies (primarily the French, Belgian and British land forces) soon collapsed under the onslaught of the so-called "blitzkrieg" strategy. Following the German breakthrough at Sedan, the BEF, along with the best of the French and Belgian armies, became trapped in Flanders. With the use of paratroopers and concentrated firepower, the Belgian and Dutch armies surrendered after several days. Luxembourg fell within the first day.

The majority of the British and elements of the French forces escaped at Dunkirk. This was due to the combined factors of poor weather, Germans mishaps, and the incredible number of British civilian ships assembled for the undertaking. Following the conclusion of events at Dunkirk on June 4, the Wehrmacht commenced Fall Rot, an offensive against the remaining French armies. With most of the French armies either destroyed or taken prisoner, the Germans quickly broke through the French lines, taking Paris on June 14. As France was falling, the British began the strategic withdrawal of all remaining British troops from France, via French ports still under Allied control.