What is the name of the battle that d-day is associated with

Normandy Invasion, also called Operation Overlord or D-Day, during World War II, the Allied invasion of western Europe, which was launched on June 6, 1944 (the most celebrated D-Day of the war), with the simultaneous landing of U.S., British, and Canadian forces on five separate beachheads in Normandy, France.

Explanation:

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answer; i believe its jutland peninsula and scandinavian peninsula;