Answer: They helped the Allied Powers to reclaim the immediate control of France.
Explanation:
And not just France. Operation Overlord is, in fact, a struggle for a complete Western Europe. With this operation, Germany lost a critical strategic place, and the outcome of the war itself was no longer questionable.
Operation Overlord is the most massive military invasion in the history of mankind and is considered one of the turning points of World War II. Thanks to the successful landing in Normandy, the Allies won one of the greatest battles for Europe in history.