context: The Normandy invasion was a major invasion of northern France by the Western Allied armies in World War II in 1944. It was called Operation Overlord. Nazi Germany had occupied France at that time and lost its territories on the eastern frontier. The Allies are working to open a new front against Germany. The Germans had been building a long chain of defense called the "Atlantic Wall" since 1940. Germany knew that an uprising would come, but not at the exact time and place. The British military and intelligence authorities deceived the Germans into believing that the landing would take place near Calais. The Allies bombed northern France months before the landing, and dropped parachutes at some points as early as night. A couple of hours before the attack, naval artillery and bombers began to rumble across the Atlantic. On the morning of June 6th, 6:30 am, 1944, the day called "D-Day" arrived when Allied landing vessels landed at Normandy at various points [1]. Already during the first day of the attack, the US, British, Canadian and Free French armies succeeded in moving about 150,000 men to separate bridges. The Germans delayed the transfer of the troops by 12 hours. Big losses came to the Allies on two strips, Juno Beach and Omaha Beach. The Allies were able to unite the various Sillanpää stations on June 13. Then, for an extended period of time, the attack stalled almost in place because of the fierce resistance of the Germans and the broken terrain. But on the other hand, the German forces were not enough to destroy Sillanpää. The Germans had better armor and artillery weaponry and the ability to fight Allied tanks, but lack of man, equipment and ammunition. The bulk of the German army was tied to the eastern front. The Allies had air superiority and could replenish their forces. The Normandy front began to move only at the end of July, when the US "Operation Cobra" succeeded. The German counterattack then turned into massacre. Only in August did the Allied attacks progress far inland. Paris was liberated by the Allies in September. At the turn of the year, the Germans tried to counterattack the Ardennes, but it faded after a good initial success.
question: When was Operation Overlord performed?
answers.text: 1944