The German occupation of Luxembourg in World War II began in May 1940 after the Grand Duchy of Luxembourg was invaded by Nazi Germany. Although Luxembourg was officially neutral, it was situated at a strategic point at the end of the French Maginot Line. On 10 May 1940, the German Wehrmacht invaded Luxembourg, Belgium and the Netherlands. Luxembourg was initially placed under a military administration, but later became a civilly administrated territory and finally was annexed directly into Germany. The Germans believed Luxembourg to be a Germanic state, and attempted to suppress what they perceived as alien French language and cultural influences. Although some Luxembourgers joined the resistance or collaborated with the Germans, both constituted a minority of the population. As German nationals, from 1942, many Luxembourgers were conscripted into the German military. Nearly 3,500 Luxembourgish Jews were murdered during the Holocaust. The liberation of the country by the Allies began in September 1944, but due to the Ardennes Offensive it was not completed until early 1945.
Eve of the invasion
The outbreak of World War II on 1 September 1939 put Luxembourg's government in a delicate situation. On the one hand, the population's sympathy lay with Belgium and France; on the other hand, due to the country's policy of neutrality since 1867's Treaty of London, the government adopted a careful non-belligerent stance towards its neighbours. As of 1 September, Radio Luxembourg stopped broadcasting. In spring 1940, fortifications were erected along the borders with Germany and France. The so-called Schuster Line, named after its constructor, consisted of massive concrete roadblocks with steel doors. The official aim of these road blocks was to slow down the progress of any invading army and give time for the guarantors of Luxembourg's neutrality to take counteractions against the invaders. However, compared to the massive power of the German forces, it had only symbolic character and helped to calm down the population. Except for its small Corps des Gendarmes et Volontaires, Luxembourg did not possess an army, due to the treaty's restrictions.
After several false alarms in the spring of 1940, the probability of a military conflict between Germany and France grew. Germany stopped the export of coke for the Luxembourgish steel industry.
Invasion
The steel doors of the Schuster Line were ordered closed on 10 May 1940 at 03:15, following movements of German troops on the east side of the border rivers Our, Sauer and Mosel. In the meantime, German special forces dressed as civilians and supported by Germans living in Luxembourg - the so-called Stoßtrupp Lützelburg - tried to sabotage radio broadcasting and the barricades along the German-Luxembourgish border but their attempt failed. The Royal Family was evacuated from its residence in Colmar-Berg to the Grand Ducal palace in Luxembourg City.
The German invasion, made up of the 1st, 2nd, and 10th Panzer Divisions began at 04:35. They encountered no significant resistance save for some bridges destroyed and some land mines, since the majority of the Luxembourgish Volunteer Corps stayed in their barracks. Luxembourgish police resisted the German troops, however, to little avail; the capital city being occupied before noon. Total Luxembourgish casualties amounted to 75 police and soldiers captured, six police wounded, and one soldier wounded. At 08:00, elements of the of General , supported by the 1st Spahi Brigade of Colonel Jouffault and the 2nd company of the 5th Armoured Battalion, crossed the southern border to conduct a probe of German forces; these units later retreated behind the Maginot Line. By the evening of 10 May 1940, most of the country, with the exception of the south, was occupied by German forces. More than 90,000 civilians evacuated from the canton of Esch-sur-Alzette as a consequence of the advance. 47,000 fled to France, 45,000 fled into the central and northern part of Luxembourg.
Grand Duchess Charlotte and the government of prime minister Pierre Dupong fled to France, Portugal and the United Kingdom, before finally settling in Canada for the duration of the war. Charlotte, exiled in London, became an important symbol of national unity. Her eldest son and heir, Jean, volunteered for the British Army in 1942. The only official representative left behind was , head of a governmental commission, as well as the 41 members of the Chamber of Deputies.