Since September 1, 1939, war has ravaged the European continent. Free and democratic countries fall one after another under the tracks of the German army; Poland, Denmark, Norway, Netherlands, Luxembourg, Belgium, then finally, France, which was obliged to sign its capitulation on June 22, 1940. General de Gaulle and the men wishing to continue the fight, took refuge in England, the last great power to fight fiercely and with determination against Nazi Germany and its fascist allies, with the help of its empire and its Commonwealth allies. The war spread once again, with the invasion of the Soviet Union by Nazi Germany and its allies on June 22, 1941, bringing the USSR back to the side of the allies in the war. On December 7, 1941, after the attack on Pearl Harbor by the Empire of Japan, the United States of America returned to war on the side of the allies, on December 11, 1941, Hitler declared war on the United States of America.
In 1943, despite Allied victories in Africa and Italy, as well as the Soviet victory at Stalingrad, pressure mounted for the Western Allies to open a second front in Europe. The latter are bogged down in the Italian campaign, on the Soviet side, the losses are accumulating at high speed, Stalin demands to lower the pressure. Roosevelt and Churchill promise to launch an operation during the year 1944. Normandy has been chosen as the landing place to open this second front; Close enough to England to carry out this operation and to support it with the air power of the United States and the British Empire. The German defenses are less well stocked there than in Pas-de-Calais or on the Atlantic coast. The terrain is clear enough with large sandy beaches for an amphibious landing. A strategic deep-water port is close to the landing site, Cherbourg.