The invasion of the European mainland by the Allies was considered to be?

On June 6, 1944, the Allied troops under General Dwight D. Eisenhower landed on France via airborne and sea based ships. There were British, Canadians, Free French, Americans and other soldiers from others nations, that landed on the Normandy area to liberate France from Germany. It is often called the "Longest Day" as it was the start of the liberation of Western Europe from Germany. Although the Allies did land on the beaches, and did get a landing area on the first day, they did not get as far inland as they thought they would and would have a couple of months of fighting in Normandy, before they finally broke the German defenses and into the rest of France. The Allies also had to bring their only landing docks, (called Mulberrys), as it would be a while before they captured a good landing dock in France.