The European Theater of Operations was the name given to the area, in Europe, that was controlled by either the Allied or Axis forces in WWII. The main goal of the Allied troops was to achieve an unconditional surrender. The biggest operation was the invasion of Normandy, also known as D-Day. This took place on June 6, 1944. Though there had been campaigns before this one in Europe, such as the invasion of Sicily, and the attempted invasion of Northern Europe, also known as Operation Market Garden, this campaign was the main invasion that got Allied troops into Europe.
The Allied troops then began a push towards Germany. There were many notable operations and battles during the war; one of the main battles was the Battle of the Bulge. This was an attack launched by the German army through the Ardennes Forest. The Allied troops prevailed. The Allied troops then pushed all the way into Germany and met up with the Soviets coming in from the east. On May 8, 1945 Germany surrendered, and the war in Europe was over.