Belgium surrendered on May 28, 1940, against the advice of the cabinet. some accused Leopold of treason, and long-held suspicions that he was pro-fascist were voiceed in public. On June 18, a government-in-exile in Bourdeux was announced and called on the King to abdicate. They soon fled to London when France fell.
Life in Belgium under German occupation was harsh. Some 20,000 Jews were deported to concentration camps during the war. The rest of the poplution, especially the northern Walloons, were considered to be “Aryans” and were scheduled to be incorporated into the Reich when the war was won. In 1941 the German Reichmark replaced the Belgian Franc as the unit of currency.
The Allies advanced into Belgium in the Fall of 1944, during Operation Market-Garden. Belgians greeted them as liberators. After hard fighting throughout the fall of 1944, Brussels was liberated on September 44. Antwerp was secured and opened to Allied shipping on December 10. But the suffering of the Belgians was not over. As part of Hitler's Ardennes Offensive in December 1944, Panzer forces raced into Belgium, conquering some towns for the second time. When the weather lifted, Allied planes bombed Belgian towns in German hands, and artillery duels and fighting compounded the food shortages.
Even though Leopold met with Hitler and secured better rations for his people in November 1940, he was not held in high regard by the Belgian public. In 1944, as the Allies advanced, Leopold and his family were taken to Germany and remained there until May 1945, when he went into exile in Switzerland.
Belgium was honored as a member of the Allies and was one of the original members of the United Nations. Leopold attempted to return to Belgium after a vote of confidence, winning a slight majority. However, unrest at his return caused him to abidicate in favor of his son Baudouin in July 1951.