Answer:
D. It was the largest Sea to Land invasion ever attempted.
Explanation:
June 6, 1944, Operation Overlord had commenced invading the German Atlantic Wall along the Normandy beaches of France. This also comprised of paratrooper attacks behind enemy lines and bombardment of French shores by British and American warshipments. Also with the help of air support.
D day is the answer it was when we effort to liberate mainland Europe from the nazis
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The purchase of Alaska added 586,412 square miles to the U.S.
